64978652544 has 256 divisors, whose sum is σ = 193062744000. Its totient is φ = 19234160640.

The previous prime is 64978652527. The next prime is 64978652579. The reversal of 64978652544 is 44525687946.

It is a happy number.

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, 14938882 + ... + 14943230.

Almost surely, 2^64978652544 is an apocalyptic number.

64978652544 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 64978652544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96531372000).

64978652544 is an abundant number, since it is smaller than the sum of its proper divisors (128084091456).

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

64978652544 is a wasteful number, since it uses less digits than its factorization.

64978652544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493 (or 4481 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 60.

It can be divided in two parts, 6497 and 8652544, that added together give a triangular number (8659041 = T₄₁₆₁).

The spelling of 64978652544 in words is "sixty-four billion, nine hundred seventy-eight million, six hundred fifty-two thousand, five hundred forty-four".