2157637730556 has 96 divisors (see below), whose sum is σ = 6290744947200. Its totient is φ = 559177113600.

The previous prime is 2157637730533. The next prime is 2157637730669. The reversal of 2157637730556 is 6550377367512.

It is a junction number, because it is equal to n+sod(n) for n = 2157637730496 and 2157637730505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2185465 + ... + 3015216.

It is an arithmetic number, because the mean of its divisors is an integer number (65528593200).

Almost surely, 2^{2157637730556} is an apocalyptic number.

It is an amenable number.

2157637730556 is an abundant number, since it is smaller than the sum of its proper divisors (4133107216644).

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

2157637730556 is a wasteful number, since it uses less digits than its factorization.

2157637730556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201155 (or 5201153 counting only the distinct ones).

The product of its (nonzero) digits is 27783000, while the sum is 57.

The spelling of 2157637730556 in words is "two trillion, one hundred fifty-seven billion, six hundred thirty-seven million, seven hundred thirty thousand, five hundred fifty-six".