157121816 has 8 divisors (see below), whose sum is σ = 294603420. Its totient is φ = 78560904.

The previous prime is 157121813. The next prime is 157121819. The reversal of 157121816 is 618121751.

It is an interprime number because it is at equal distance from previous prime (157121813) and next prime (157121819).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157121813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9820106 + ... + 9820121.

Almost surely, 2^157121816 is an apocalyptic number.

It is an amenable number.

157121816 is a deficient number, since it is larger than the sum of its proper divisors (137481604).

157121816 is a wasteful number, since it uses less digits than its factorization.

157121816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19640233 (or 19640229 counting only the distinct ones).

The product of its digits is 3360, while the sum is 32.

The square root of 157121816 is about 12534.8241311955. The cubic root of 157121816 is about 539.6085594815.

The spelling of 157121816 in words is "one hundred fifty-seven million, one hundred twenty-one thousand, eight hundred sixteen".