666740734560 has 192 divisors, whose sum is σ = 2365560711360. Its totient is φ = 175361863680.

The previous prime is 666740734537. The next prime is 666740734601. The reversal of 666740734560 is 65437047666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 666740734497 and 666740734506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 741751 + ... + 1372470.

It is an arithmetic number, because the mean of its divisors is an integer number (12320628705).

Almost surely, 2^666740734560 is an apocalyptic number.

666740734560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666740734560 is an abundant number, since it is smaller than the sum of its proper divisors (1698819976800).

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

666740734560 is a wasteful number, since it uses less digits than its factorization.

666740734560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114318 (or 2114304 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 54.

The spelling of 666740734560 in words is "six hundred sixty-six billion, seven hundred forty million, seven hundred thirty-four thousand, five hundred sixty".