649687667760 has 120 divisors (see below), whose sum is σ = 2182016083104. Its totient is φ = 173238266880.

The previous prime is 649687667743. The next prime is 649687667789. The reversal of 649687667760 is 67766786946.

649687667760 is a `hidden beast` number, since 6 + 496 + 8 + 7 + 6 + 6 + 77 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17602125 + ... + 17638995.

Almost surely, 2^649687667760 is an apocalyptic number.

649687667760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649687667760 is an abundant number, since it is smaller than the sum of its proper divisors (1532328415344).

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

649687667760 is a wasteful number, since it uses less digits than its factorization.

649687667760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61363 (or 61354 counting only the distinct ones).

The product of its (nonzero) digits is 768144384, while the sum is 72.

The spelling of 649687667760 in words is "six hundred forty-nine billion, six hundred eighty-seven million, six hundred sixty-seven thousand, seven hundred sixty".