18813651764 has 6 divisors (see below), whose sum is σ = 32923890594. Its totient is φ = 9406825880.

The previous prime is 18813651707. The next prime is 18813651799. The reversal of 18813651764 is 46715631881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18730112164 + 83539600 = 136858^2 + 9140^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2351706467 + ... + 2351706474.

It is an arithmetic number, because the mean of its divisors is an integer number (5487315099).

Almost surely, 2^18813651764 is an apocalyptic number.

It is an amenable number.

18813651764 is a deficient number, since it is larger than the sum of its proper divisors (14110238830).

18813651764 is a wasteful number, since it uses less digits than its factorization.

18813651764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4703412945 (or 4703412943 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The spelling of 18813651764 in words is "eighteen billion, eight hundred thirteen million, six hundred fifty-one thousand, seven hundred sixty-four".