191295659920 has 20 divisors (see below), whose sum is σ = 444762409500. Its totient is φ = 76518263936.

The previous prime is 191295659897. The next prime is 191295659957. The reversal of 191295659920 is 29956592191.

It can be written as a sum of positive squares in 2 ways, for example, as 30818504704 + 160477155216 = 175552^2 + 400596^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1195597795 + ... + 1195597954.

It is an arithmetic number, because the mean of its divisors is an integer number (22238120475).

Almost surely, 2^191295659920 is an apocalyptic number.

191295659920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191295659920 is an abundant number, since it is smaller than the sum of its proper divisors (253466749580).

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

191295659920 is a wasteful number, since it uses less digits than its factorization.

191295659920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391195762 (or 2391195756 counting only the distinct ones).

The product of its (nonzero) digits is 3936600, while the sum is 58.

The spelling of 191295659920 in words is "one hundred ninety-one billion, two hundred ninety-five million, six hundred fifty-nine thousand, nine hundred twenty".