72665551424 has 14 divisors (see below), whose sum is σ = 144195703734. Its totient is φ = 36332775680.

The previous prime is 72665551411. The next prime is 72665551429. The reversal of 72665551424 is 42415556627.

It can be written as a sum of positive squares in only one way, i.e., 60697191424 + 11968360000 = 246368^2 + 109400^2 .

It is not an unprimeable number, because it can be changed into a prime (72665551429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 567699557 + ... + 567699684.

Almost surely, 2^72665551424 is an apocalyptic number.

It is an amenable number.

72665551424 is a deficient number, since it is larger than the sum of its proper divisors (71530152310).

72665551424 is a wasteful number, since it uses less digits than its factorization.

72665551424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135399253 (or 1135399243 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 47.

The spelling of 72665551424 in words is "seventy-two billion, six hundred sixty-five million, five hundred fifty-one thousand, four hundred twenty-four".