72666376666 has 16 divisors (see below), whose sum is σ = 117601145928. Its totient is φ = 33476328000.

The previous prime is 72666376661. The next prime is 72666376681. The reversal of 72666376666 is 66667366627.

It can be written as a sum of positive squares in 4 ways, for example, as 54345400641 + 18320976025 = 233121^2 + 135355^2 .

It is not an unprimeable number, because it can be changed into a prime (72666376661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2568985 + ... + 2597116.

Almost surely, 2^72666376666 is an apocalyptic number.

72666376666 is a deficient number, since it is larger than the sum of its proper divisors (44934769262).

72666376666 is a wasteful number, since it uses less digits than its factorization.

72666376666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166657.

The product of its digits is 82301184, while the sum is 61.

The spelling of 72666376666 in words is "seventy-two billion, six hundred sixty-six million, three hundred seventy-six thousand, six hundred sixty-six".