63720579664 has 160 divisors (see below), whose sum is σ = 154160133120. Its totient is φ = 24895143936.

The previous prime is 63720579649. The next prime is 63720579677. The reversal of 63720579664 is 46697502736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7968052 + ... + 7976044.

It is an arithmetic number, because the mean of its divisors is an integer number (963500832).

Almost surely, 2^63720579664 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 63720579664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77080066560).

63720579664 is an abundant number, since it is smaller than the sum of its proper divisors (90439553456).

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

63720579664 is a wasteful number, since it uses less digits than its factorization.

63720579664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8157 (or 8151 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 55.

The spelling of 63720579664 in words is "sixty-three billion, seven hundred twenty million, five hundred seventy-nine thousand, six hundred sixty-four".