64979520000 has 400 divisors, whose sum is σ = 218596276800. Its totient is φ = 17145856000.

The previous prime is 64979519993. The next prime is 64979520017. The reversal of 64979520000 is 2597946.

It is a tau number, because it is divible by the number of its divisors (400).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 108479701 + ... + 108480299.

It is an arithmetic number, because the mean of its divisors is an integer number (546490692).

Almost surely, 2^64979520000 is an apocalyptic number.

64979520000 is a gapful number since it is divisible by the number (60) 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 64979520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109298138400).

64979520000 is an abundant number, since it is smaller than the sum of its proper divisors (153616756800).

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

64979520000 is an equidigital number, since it uses as much as digits as its factorization.

64979520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 64979520000 in words is "sixty-four billion, nine hundred seventy-nine million, five hundred twenty thousand".