666666740736 has 88 divisors (see below), whose sum is σ = 1974344437040. Its totient is φ = 222222237696.

The previous prime is 666666740731. The next prime is 666666740767. The reversal of 666666740736 is 637047666666.

It is a super-2 number, since 2×666666740736² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666666740731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12028681 + ... + 12083976.

Almost surely, 2^666666740736 is an apocalyptic number.

It is an amenable number.

666666740736 is an abundant number, since it is smaller than the sum of its proper divisors (1307677696304).

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

666666740736 is a wasteful number, since it uses less digits than its factorization.

666666740736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24112686 (or 24112662 counting only the distinct ones).

The product of its (nonzero) digits is 164602368, while the sum is 63.

The spelling of 666666740736 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred thirty-six".