157978854117 has 16 divisors (see below), whose sum is σ = 267477425280. Its totient is φ = 90273630816.

The previous prime is 157978854109. The next prime is 157978854119. The reversal of 157978854117 is 711458879751.

157978854117 is a `hidden beast` number, since 1 + 5 + 7 + 9 + 7 + 88 + 541 + 1 + 7 = 666.

It is not a de Polignac number, because 157978854117 - 2³ = 157978854109 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157978854119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417933288 + ... + 417933665.

It is an arithmetic number, because the mean of its divisors is an integer number (16717339080).

Almost surely, 2^157978854117 is an apocalyptic number.

It is an amenable number.

157978854117 is a deficient number, since it is larger than the sum of its proper divisors (109498571163).

157978854117 is an equidigital number, since it uses as much as digits as its factorization.

157978854117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835866969 (or 835866963 counting only the distinct ones).

The product of its digits is 19756800, while the sum is 63.

The spelling of 157978854117 in words is "one hundred fifty-seven billion, nine hundred seventy-eight million, eight hundred fifty-four thousand, one hundred seventeen".