2638261051884 has 48 divisors (see below), whose sum is σ = 7199932700800. Its totient is φ = 833135068368.

The previous prime is 2638261051847. The next prime is 2638261051967. The reversal of 2638261051884 is 4881501628362.

2638261051884 is a `hidden beast` number, since 2 + 6 + 3 + 8 + 2 + 610 + 5 + 18 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 2638261051884.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642849082 + ... + 642853185.

Almost surely, 2^{2638261051884} is an apocalyptic number.

It is an amenable number.

2638261051884 is an abundant number, since it is smaller than the sum of its proper divisors (4561671648916).

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

2638261051884 is a wasteful number, since it uses less digits than its factorization.

2638261051884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285702299 (or 1285702291 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 2638261051884 in words is "two trillion, six hundred thirty-eight billion, two hundred sixty-one million, fifty-one thousand, eight hundred eighty-four".