191941605657 has 24 divisors (see below), whose sum is σ = 284144246568. Its totient is φ = 124781568000.

The previous prime is 191941605641. The next prime is 191941605677. The reversal of 191941605657 is 756506149191.

191941605657 is a `hidden beast` number, since 1 + 9 + 19 + 4 + 1 + 60 + 565 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5545631961 + 186395973696 = 74469^2 + 431736^2 .

It is not a de Polignac number, because 191941605657 - 2⁴ = 191941605641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191941605677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673657 + ... + 915257.

It is an arithmetic number, because the mean of its divisors is an integer number (11839343607).

Almost surely, 2^191941605657 is an apocalyptic number.

It is an amenable number.

191941605657 is a deficient number, since it is larger than the sum of its proper divisors (92202640911).

191941605657 is a wasteful number, since it uses less digits than its factorization.

191941605657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243801 (or 243798 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 191941605657 in words is "one hundred ninety-one billion, nine hundred forty-one million, six hundred five thousand, six hundred fifty-seven".