64950779520 has 768 divisors, whose sum is σ = 259912972800. Its totient is φ = 14780620800.

The previous prime is 64950779519. The next prime is 64950779527. The reversal of 64950779520 is 2597705946.

64950779520 is a `hidden beast` number, since 6 + 49 + 5 + 0 + 7 + 79 + 520 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64950779527) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 196225755 + ... + 196226085.

It is an arithmetic number, because the mean of its divisors is an integer number (338428350).

Almost surely, 2^64950779520 is an apocalyptic number.

64950779520 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 64950779520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129956486400).

64950779520 is an abundant number, since it is smaller than the sum of its proper divisors (194962193280).

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

64950779520 is a wasteful number, since it uses less digits than its factorization.

64950779520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 64950779520 in words is "sixty-four billion, nine hundred fifty million, seven hundred seventy-nine thousand, five hundred twenty".