2638257941772 has 18 divisors (see below), whose sum is σ = 6668929797348. Its totient is φ = 879419313912.

The previous prime is 2638257941701. The next prime is 2638257941779. The reversal of 2638257941772 is 2771497528362.

It is a happy number.

2638257941772 is a `hidden beast` number, since 2 + 6 + 3 + 82 + 5 + 79 + 417 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (2638257941779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36642471378 + ... + 36642471449.

Almost surely, 2^{2638257941772} is an apocalyptic number.

It is an amenable number.

2638257941772 is an abundant number, since it is smaller than the sum of its proper divisors (4030671855576).

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

2638257941772 is a wasteful number, since it uses less digits than its factorization.

2638257941772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73284942837 (or 73284942832 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 63.

The spelling of 2638257941772 in words is "two trillion, six hundred thirty-eight billion, two hundred fifty-seven million, nine hundred forty-one thousand, seven hundred seventy-two".