18513969652 has 12 divisors (see below), whose sum is σ = 32553000256. Its totient is φ = 9213112440.

The previous prime is 18513969647. The next prime is 18513969689. The reversal of 18513969652 is 25696931581.

It is a super-2 number, since 2×18513969652² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18513969593 and 18513969602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10967148 + ... + 10968835.

Almost surely, 2^18513969652 is an apocalyptic number.

It is an amenable number.

18513969652 is a deficient number, since it is larger than the sum of its proper divisors (14039030604).

18513969652 is a wasteful number, since it uses less digits than its factorization.

18513969652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21936198 (or 21936196 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 55.

The spelling of 18513969652 in words is "eighteen billion, five hundred thirteen million, nine hundred sixty-nine thousand, six hundred fifty-two".