157861817520 has 320 divisors, whose sum is σ = 540259849728. Its totient is φ = 38128358400.

The previous prime is 157861817513. The next prime is 157861817557. The reversal of 157861817520 is 25718168751.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 105733894 + ... + 105735386.

Almost surely, 2^157861817520 is an apocalyptic number.

157861817520 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 157861817520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270129924864).

157861817520 is an abundant number, since it is smaller than the sum of its proper divisors (382398032208).

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

157861817520 is a wasteful number, since it uses less digits than its factorization.

157861817520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 1845 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 51.

The spelling of 157861817520 in words is "one hundred fifty-seven billion, eight hundred sixty-one million, eight hundred seventeen thousand, five hundred twenty".