64857256464 has 720 divisors, whose sum is σ = 235509454208. Its totient is φ = 14963097600.

The previous prime is 64857256417. The next prime is 64857256481. The reversal of 64857256464 is 46465275846.

Its product of digits (38707200) is a multiple of the sum of its prime divisors (150).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 888455532 + ... + 888455604.

Almost surely, 2^64857256464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64857256464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117754727104).

64857256464 is an abundant number, since it is smaller than the sum of its proper divisors (170652197744).

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

64857256464 is a wasteful number, since it uses less digits than its factorization.

64857256464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 150 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 57.

The spelling of 64857256464 in words is "sixty-four billion, eight hundred fifty-seven million, two hundred fifty-six thousand, four hundred sixty-four".