666678579264 has 168 divisors, whose sum is σ = 1997298121728. Its totient is φ = 220475727360.

The previous prime is 666678579227. The next prime is 666678579299. The reversal of 666678579264 is 462975876666.

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

It is a junction number, because it is equal to n+sod(n) for n = 666678579192 and 666678579201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1806334 + ... + 2143874.

It is an arithmetic number, because the mean of its divisors is an integer number (11888679296).

Almost surely, 2^666678579264 is an apocalyptic number.

666678579264 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 666678579264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998649060864).

666678579264 is an abundant number, since it is smaller than the sum of its proper divisors (1330619542464).

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

666678579264 is a wasteful number, since it uses less digits than its factorization.

666678579264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337695 (or 337673 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 72.

The spelling of 666678579264 in words is "six hundred sixty-six billion, six hundred seventy-eight million, five hundred seventy-nine thousand, two hundred sixty-four".