157721496930 has 48 divisors (see below), whose sum is σ = 410150987064. Its totient is φ = 42051363840.

The previous prime is 157721496871. The next prime is 157721496941. The reversal of 157721496930 is 39694127751.

157721496930 is a `hidden beast` number, since 1 + 57 + 72 + 1 + 496 + 9 + 30 = 666.

157721496930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 122110410249 + 35611086681 = 349443^2 + 188709^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342450 + ... + 657810.

Almost surely, 2^157721496930 is an apocalyptic number.

157721496930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157721496930 is an abundant number, since it is smaller than the sum of its proper divisors (252429490134).

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

157721496930 is a wasteful number, since it uses less digits than its factorization.

157721496930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320931 (or 320928 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 157721496930 in words is "one hundred fifty-seven billion, seven hundred twenty-one million, four hundred ninety-six thousand, nine hundred thirty".