64979371376640 has 2640 divisors, whose sum is σ = 284190424398720. Its totient is φ = 13931406950400.

The previous prime is 64979371376599. The next prime is 64979371376657. The reversal of 64979371376640 is 4667317397946.

64979371376640 is a `hidden beast` number, since 6 + 49 + 7 + 93 + 71 + 376 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 175 ways as a sum of consecutive naturals, for example, 643360112590 + ... + 643360112690.

Almost surely, 2^{64979371376640} is an apocalyptic number.

64979371376640 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 64979371376640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142095212199360).

64979371376640 is an abundant number, since it is smaller than the sum of its proper divisors (219211053022080).

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

64979371376640 is an frugal number, since it uses more digits than its factorization.

64979371376640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 864162432, while the sum is 72.

The spelling of 64979371376640 in words is "sixty-four trillion, nine hundred seventy-nine billion, three hundred seventy-one million, three hundred seventy-six thousand, six hundred forty".