2661138372 has 24 divisors (see below), whose sum is σ = 6216348096. Its totient is φ = 886042528.

The previous prime is 2661138349. The next prime is 2661138379. The reversal of 2661138372 is 2738311662.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2661138372.

It is not an unprimeable number, because it can be changed into a prime (2661138379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114363 + ... + 135650.

It is an arithmetic number, because the mean of its divisors is an integer number (259014504).

Almost surely, 2^2661138372 is an apocalyptic number.

It is an amenable number.

2661138372 is an abundant number, since it is smaller than the sum of its proper divisors (3555209724).

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

2661138372 is a wasteful number, since it uses less digits than its factorization.

2661138372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250907 (or 250905 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 2661138372 is about 51586.2226955996. Note that the first 3 decimals coincide. The cubic root of 2661138372 is about 1385.7636093745.

The spelling of 2661138372 in words is "two billion, six hundred sixty-one million, one hundred thirty-eight thousand, three hundred seventy-two".