157655442690 has 112 divisors (see below), whose sum is σ = 450503357688. Its totient is φ = 39568393728.

The previous prime is 157655442683. The next prime is 157655442691. The reversal of 157655442690 is 96244556751.

157655442690 is a `hidden beast` number, since 1 + 5 + 7 + 6 + 5 + 544 + 2 + 6 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 107953644969 + 49701797721 = 328563^2 + 222939^2 .

It is a super-2 number, since 2×157655442690² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (157655442691) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 512137 + ... + 759996.

Almost surely, 2^157655442690 is an apocalyptic number.

157655442690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157655442690 is an abundant number, since it is smaller than the sum of its proper divisors (292847914998).

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

157655442690 is a wasteful number, since it uses less digits than its factorization.

157655442690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272175 (or 1272160 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 157655442690 in words is "one hundred fifty-seven billion, six hundred fifty-five million, four hundred forty-two thousand, six hundred ninety".