72666635476 has 24 divisors (see below), whose sum is σ = 127760953320. Its totient is φ = 36163625472.

The previous prime is 72666635467. The next prime is 72666635519. The reversal of 72666635476 is 67453666627.

It can be written as a sum of positive squares in 4 ways, for example, as 28513699600 + 44152935876 = 168860^2 + 210126^2 .

It is a super-2 number, since 2×72666635476² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72666635476.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2705280 + ... + 2732008.

It is an arithmetic number, because the mean of its divisors is an integer number (5323373055).

Almost surely, 2^72666635476 is an apocalyptic number.

It is an amenable number.

72666635476 is a deficient number, since it is larger than the sum of its proper divisors (55094317844).

72666635476 is a wasteful number, since it uses less digits than its factorization.

72666635476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29883 (or 29881 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 58.

The spelling of 72666635476 in words is "seventy-two billion, six hundred sixty-six million, six hundred thirty-five thousand, four hundred seventy-six".