18639460652 has 6 divisors (see below), whose sum is σ = 32619056148. Its totient is φ = 9319730324.

The previous prime is 18639460649. The next prime is 18639460657. The reversal of 18639460652 is 25606493681.

It is a self number, because there is not a number n which added to its sum of digits gives 18639460652.

It is not an unprimeable number, because it can be changed into a prime (18639460657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2329932578 + ... + 2329932585.

It is an arithmetic number, because the mean of its divisors is an integer number (5436509358).

Almost surely, 2^18639460652 is an apocalyptic number.

It is an amenable number.

18639460652 is a deficient number, since it is larger than the sum of its proper divisors (13979595496).

18639460652 is a wasteful number, since it uses less digits than its factorization.

18639460652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659865167 (or 4659865165 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 18639460652 in words is "eighteen billion, six hundred thirty-nine million, four hundred sixty thousand, six hundred fifty-two".