64921415760 has 140 divisors (see below), whose sum is σ = 226310113812. Its totient is φ = 17312361984.

The previous prime is 64921415759. The next prime is 64921415833. The reversal of 64921415760 is 6751412946.

64921415760 is a `hidden beast` number, since 6 + 492 + 1 + 4 + 157 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27590538816 + 37330876944 = 166104^2 + 193212^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 498277 + ... + 614916.

Almost surely, 2^64921415760 is an apocalyptic number.

64921415760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64921415760 is an abundant number, since it is smaller than the sum of its proper divisors (161388698052).

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

64921415760 is a wasteful number, since it uses less digits than its factorization.

64921415760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113224 (or 1113203 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 64921415760 in words is "sixty-four billion, nine hundred twenty-one million, four hundred fifteen thousand, seven hundred sixty".