64648131768828 has 18 divisors (see below), whose sum is σ = 163416110860184. Its totient is φ = 21549377256264.

The previous prime is 64648131768817. The next prime is 64648131768881. The reversal of 64648131768828 is 82886713184646.

64648131768828 is a `hidden beast` number, since 6 + 4 + 6 + 481 + 3 + 1 + 7 + 68 + 82 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×64648131768828² (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 5 ways as a sum of consecutive naturals, for example, 897890718976 + ... + 897890719047.

Almost surely, 2^{64648131768828} is an apocalyptic number.

It is an amenable number.

64648131768828 is an abundant number, since it is smaller than the sum of its proper divisors (98767979091356).

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

64648131768828 is a wasteful number, since it uses less digits than its factorization.

64648131768828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795781438033 (or 1795781438028 counting only the distinct ones).

The product of its digits is 594542592, while the sum is 72.

The spelling of 64648131768828 in words is "sixty-four trillion, six hundred forty-eight billion, one hundred thirty-one million, seven hundred sixty-eight thousand, eight hundred twenty-eight".