72285521668 has 6 divisors (see below), whose sum is σ = 126499662926. Its totient is φ = 36142760832.

The previous prime is 72285521599. The next prime is 72285521677. The reversal of 72285521668 is 86612558227.

It can be written as a sum of positive squares in only one way, i.e., 52730855424 + 19554666244 = 229632^2 + 139838^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035690205 + ... + 9035690212.

Almost surely, 2^72285521668 is an apocalyptic number.

It is an amenable number.

72285521668 is a deficient number, since it is larger than the sum of its proper divisors (54214141258).

72285521668 is a wasteful number, since it uses less digits than its factorization.

72285521668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18071380421 (or 18071380419 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 52.

The spelling of 72285521668 in words is "seventy-two billion, two hundred eighty-five million, five hundred twenty-one thousand, six hundred sixty-eight".