157643817 has 16 divisors (see below), whose sum is σ = 230876160. Its totient is φ = 95234832.

The previous prime is 157643743. The next prime is 157643819. The reversal of 157643817 is 718346751.

It is not a de Polignac number, because 157643817 - 2⁸ = 157643561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157643819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58813 + ... + 61434.

It is an arithmetic number, because the mean of its divisors is an integer number (14429760).

Almost surely, 2^157643817 is an apocalyptic number.

It is an amenable number.

157643817 is a deficient number, since it is larger than the sum of its proper divisors (73232343).

157643817 is a wasteful number, since it uses less digits than its factorization.

157643817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120292.

The product of its digits is 141120, while the sum is 42.

The square root of 157643817 is about 12555.6288970326. The cubic root of 157643817 is about 540.2054739320.

The spelling of 157643817 in words is "one hundred fifty-seven million, six hundred forty-three thousand, eight hundred seventeen".