64489930577856 has 224 divisors, whose sum is σ = 221711415636480. Its totient is φ = 17997189783552.

The previous prime is 64489930577833. The next prime is 64489930577873. The reversal of 64489930577856 is 65877503998446.

64489930577856 is a `hidden beast` number, since 6 + 4 + 4 + 8 + 9 + 9 + 30 + 577 + 8 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×64489930577856² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61474161 + ... + 62514416.

It is an arithmetic number, because the mean of its divisors is an integer number (989783105520).

Almost surely, 2^{64489930577856} is an apocalyptic number.

It is an amenable number.

64489930577856 is an abundant number, since it is smaller than the sum of its proper divisors (157221485058624).

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

64489930577856 is a wasteful number, since it uses less digits than its factorization.

64489930577856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123988648 (or 123988632 counting only the distinct ones).

The product of its (nonzero) digits is 10973491200, while the sum is 81.

The spelling of 64489930577856 in words is "sixty-four trillion, four hundred eighty-nine billion, nine hundred thirty million, five hundred seventy-seven thousand, eight hundred fifty-six".