157187836821 has 16 divisors (see below), whose sum is σ = 209775201408. Its totient is φ = 104696232000.

The previous prime is 157187836807. The next prime is 157187836823. The reversal of 157187836821 is 128638781751.

It is a happy number.

It is not a de Polignac number, because 157187836821 - 2¹⁰ = 157187835797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157187836823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25038735 + ... + 25045011.

It is an arithmetic number, because the mean of its divisors is an integer number (13110950088).

Almost surely, 2^157187836821 is an apocalyptic number.

It is an amenable number.

157187836821 is a deficient number, since it is larger than the sum of its proper divisors (52587364587).

157187836821 is a wasteful number, since it uses less digits than its factorization.

157187836821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12572.

The product of its digits is 4515840, while the sum is 57.

The spelling of 157187836821 in words is "one hundred fifty-seven billion, one hundred eighty-seven million, eight hundred thirty-six thousand, eight hundred twenty-one".