157798571520 has 320 divisors, whose sum is σ = 513883180800. Its totient is φ = 41298690048.

The previous prime is 157798571519. The next prime is 157798571549. The reversal of 157798571520 is 25175897751.

It is a tau number, because it is divible by the number of its divisors (320).

It is a super-2 number, since 2×157798571520² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231037099 + ... + 231037781.

It is an arithmetic number, because the mean of its divisors is an integer number (1605884940).

Almost surely, 2^157798571520 is an apocalyptic number.

157798571520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157798571520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256941590400).

157798571520 is an abundant number, since it is smaller than the sum of its proper divisors (356084609280).

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

157798571520 is an equidigital number, since it uses as much as digits as its factorization.

157798571520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 6174000, while the sum is 57.

The spelling of 157798571520 in words is "one hundred fifty-seven billion, seven hundred ninety-eight million, five hundred seventy-one thousand, five hundred twenty".