2661133638 has 8 divisors (see below), whose sum is σ = 5322267288. Its totient is φ = 887044544.

The previous prime is 2661133637. The next prime is 2661133639. The reversal of 2661133638 is 8363311662.

It is an interprime number because it is at equal distance from previous prime (2661133637) and next prime (2661133639).

It is a sphenic number, since it is the product of 3 distinct primes.

2661133638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 2661133596 and 2661133605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661133637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221761131 + ... + 221761142.

It is an arithmetic number, because the mean of its divisors is an integer number (665283411).

Almost surely, 2^2661133638 is an apocalyptic number.

2661133638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2661133638 is a wasteful number, since it uses less digits than its factorization.

2661133638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443522278.

The product of its digits is 93312, while the sum is 39.

The square root of 2661133638 is about 51586.1768112350. The cubic root of 2661133638 is about 1385.7627876449.

The spelling of 2661133638 in words is "two billion, six hundred sixty-one million, one hundred thirty-three thousand, six hundred thirty-eight".