191559128257 has 16 divisors (see below), whose sum is σ = 219828032512. Its totient is φ = 163516741200.

The previous prime is 191559128209. The next prime is 191559128297. The reversal of 191559128257 is 752821955191.

It is a cyclic number.

It is not a de Polignac number, because 191559128257 - 2⁷ = 191559128129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191559128198 and 191559128207.

It is not an unprimeable number, because it can be changed into a prime (191559128207) 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, 3433132 + ... + 3488482.

It is an arithmetic number, because the mean of its divisors is an integer number (13739252032).

Almost surely, 2^191559128257 is an apocalyptic number.

It is an amenable number.

191559128257 is a deficient number, since it is larger than the sum of its proper divisors (28268904255).

191559128257 is a wasteful number, since it uses less digits than its factorization.

191559128257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57388.

The product of its digits is 2268000, while the sum is 55.

The spelling of 191559128257 in words is "one hundred ninety-one billion, five hundred fifty-nine million, one hundred twenty-eight thousand, two hundred fifty-seven".