64625278464 has 420 divisors, whose sum is σ = 200361563688. Its totient is φ = 20812308480.

The previous prime is 64625278429. The next prime is 64625278489. The reversal of 64625278464 is 46487252646.

It is a happy number.

64625278464 is a `hidden beast` number, since 6 + 4 + 62 + 52 + 78 + 464 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 64625278464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 627429837 + ... + 627429939.

Almost surely, 2^64625278464 is an apocalyptic number.

64625278464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64625278464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100180781844).

64625278464 is an abundant number, since it is smaller than the sum of its proper divisors (135736285224).

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

64625278464 is an frugal number, since it uses more digits than its factorization.

64625278464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 149 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 54.

The spelling of 64625278464 in words is "sixty-four billion, six hundred twenty-five million, two hundred seventy-eight thousand, four hundred sixty-four".