157991234140 has 24 divisors (see below), whose sum is σ = 338840776512. Its totient is φ = 61851887040.

The previous prime is 157991234117. The next prime is 157991234179. The reversal of 157991234140 is 41432199751.

It is a super-2 number, since 2×157991234140² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84036951 + ... + 84038830.

It is an arithmetic number, because the mean of its divisors is an integer number (14118365688).

Almost surely, 2^157991234140 is an apocalyptic number.

157991234140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157991234140 is an abundant number, since it is smaller than the sum of its proper divisors (180849542372).

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

157991234140 is a wasteful number, since it uses less digits than its factorization.

157991234140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168075837 (or 168075835 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 157991234140 in words is "one hundred fifty-seven billion, nine hundred ninety-one million, two hundred thirty-four thousand, one hundred forty".