64694519388576 has 1536 divisors, whose sum is σ = 243234032025600. Its totient is φ = 16245245952000.

The previous prime is 64694519388571. The next prime is 64694519388601. The reversal of 64694519388576 is 67588391549646.

64694519388576 is a `hidden beast` number, since 6 + 4 + 6 + 9 + 4 + 5 + 1 + 9 + 38 + 8 + 576 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 64694519388495 and 64694519388504.

It is not an unprimeable number, because it can be changed into a prime (64694519388571) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 119583214866 + ... + 119583215406.

It is an arithmetic number, because the mean of its divisors is an integer number (158355489600).

Almost surely, 2^{64694519388576} is an apocalyptic number.

64694519388576 is a gapful number since it is divisible by the number (66) 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 64694519388576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121617016012800).

64694519388576 is an abundant number, since it is smaller than the sum of its proper divisors (178539512637024).

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

64694519388576 is a wasteful number, since it uses less digits than its factorization.

64694519388576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1077 counting only the distinct ones).

The product of its digits is 9405849600, while the sum is 81.

The spelling of 64694519388576 in words is "sixty-four trillion, six hundred ninety-four billion, five hundred nineteen million, three hundred eighty-eight thousand, five hundred seventy-six".