2661272136 has 24 divisors (see below), whose sum is σ = 7207612230. Its totient is φ = 887090688.

The previous prime is 2661272111. The next prime is 2661272137. The reversal of 2661272136 is 6312721662.

2661272136 is a `hidden beast` number, since 2 + 6 + 612 + 7 + 2 + 1 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1689703236 + 971568900 = 41106^2 + 31170^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2661272136.

It is not an unprimeable number, because it can be changed into a prime (2661272137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18480985 + ... + 18481128.

Almost surely, 2^2661272136 is an apocalyptic number.

It is an amenable number.

2661272136 is an abundant number, since it is smaller than the sum of its proper divisors (4546340094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661272136 is a wasteful number, since it uses less digits than its factorization.

2661272136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36962125 (or 36962118 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 2661272136 is about 51587.5191882688. The cubic root of 2661272136 is about 1385.7868277810.

Adding to 2661272136 its reverse (6312721662), we get a palindrome (8973993798).

The spelling of 2661272136 in words is "two billion, six hundred sixty-one million, two hundred seventy-two thousand, one hundred thirty-six".