191657438955 has 32 divisors (see below), whose sum is σ = 340899624000. Its totient is φ = 102164714496.

The previous prime is 191657438941. The next prime is 191657438963. The reversal of 191657438955 is 559834756191.

191657438955 is a `hidden beast` number, since 1 + 9 + 1 + 6 + 574 + 3 + 8 + 9 + 55 = 666.

It is not a de Polignac number, because 191657438955 - 2⁵ = 191657438923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191657438892 and 191657438901.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101094 + ... + 627323.

It is an arithmetic number, because the mean of its divisors is an integer number (10653113250).

Almost surely, 2^191657438955 is an apocalyptic number.

191657438955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

191657438955 is a deficient number, since it is larger than the sum of its proper divisors (149242185045).

191657438955 is a wasteful number, since it uses less digits than its factorization.

191657438955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730380 (or 730374 counting only the distinct ones).

The product of its digits is 40824000, while the sum is 63.

The spelling of 191657438955 in words is "one hundred ninety-one billion, six hundred fifty-seven million, four hundred thirty-eight thousand, nine hundred fifty-five".