18612912650 has 48 divisors (see below), whose sum is σ = 35052053400. Its totient is φ = 7352463360.

The previous prime is 18612912649. The next prime is 18612912671. The reversal of 18612912650 is 5621921681.

It can be written as a sum of positive squares in 12 ways, for example, as 1220314489 + 17392598161 = 34933^2 + 131881^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18612912598 and 18612912607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4505786 + ... + 4509914.

Almost surely, 2^18612912650 is an apocalyptic number.

18612912650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18612912650 is a deficient number, since it is larger than the sum of its proper divisors (16439140750).

18612912650 is a wasteful number, since it uses less digits than its factorization.

18612912650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5243 (or 5238 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 18612912650 in words is "eighteen billion, six hundred twelve million, nine hundred twelve thousand, six hundred fifty".