91641551968 has 24 divisors (see below), whose sum is σ = 180426060360. Its totient is φ = 45819060480.

The previous prime is 91641551933. The next prime is 91641551983. The reversal of 91641551968 is 86915514619.

It is a happy number.

It is a congruent number.

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, 1584748 + ... + 1641556.

It is an arithmetic number, because the mean of its divisors is an integer number (7517752515).

Almost surely, 2^91641551968 is an apocalyptic number.

It is an amenable number.

91641551968 is a deficient number, since it is larger than the sum of its proper divisors (88784508392).

91641551968 is a wasteful number, since it uses less digits than its factorization.

91641551968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107230 (or 107222 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 55.

The spelling of 91641551968 in words is "ninety-one billion, six hundred forty-one million, five hundred fifty-one thousand, nine hundred sixty-eight".