64191109808976 has 80 divisors (see below), whose sum is σ = 169460532998400. Its totient is φ = 20928763920384.

The previous prime is 64191109808941. The next prime is 64191109808981. The reversal of 64191109808976 is 67980890119146.

It is a self number, because there is not a number n which added to its sum of digits gives 64191109808976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5212081 + ... + 12471888.

It is an arithmetic number, because the mean of its divisors is an integer number (2118256662480).

Almost surely, 2^{64191109808976} is an apocalyptic number.

It is an amenable number.

64191109808976 is an abundant number, since it is smaller than the sum of its proper divisors (105269423189424).

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

64191109808976 is a wasteful number, since it uses less digits than its factorization.

64191109808976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17685636 (or 17685630 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 69.

The spelling of 64191109808976 in words is "sixty-four trillion, one hundred ninety-one billion, one hundred nine million, eight hundred eight thousand, nine hundred seventy-six".