18645756772 has 6 divisors (see below), whose sum is σ = 32630074358. Its totient is φ = 9322878384.

The previous prime is 18645756769. The next prime is 18645756821. The reversal of 18645756772 is 27765754681.

It can be written as a sum of positive squares in only one way, i.e., 10081364836 + 8564391936 = 100406^2 + 92544^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330719593 + ... + 2330719600.

Almost surely, 2^18645756772 is an apocalyptic number.

It is an amenable number.

18645756772 is a deficient number, since it is larger than the sum of its proper divisors (13984317586).

18645756772 is a wasteful number, since it uses less digits than its factorization.

18645756772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661439197 (or 4661439195 counting only the distinct ones).

The product of its digits is 19756800, while the sum is 58.

The spelling of 18645756772 in words is "eighteen billion, six hundred forty-five million, seven hundred fifty-six thousand, seven hundred seventy-two".