18212890624 has 24 divisors (see below), whose sum is σ = 36416892330. Its totient is φ = 9106444288.

The previous prime is 18212890621. The next prime is 18212890627. The reversal of 18212890624 is 42609821281.

It is an interprime number because it is at equal distance from previous prime (18212890621) and next prime (18212890627).

It can be written as a sum of positive squares in only one way, i.e., 15985050624 + 2227840000 = 126432^2 + 47200^2 .

It is a trimorphic number since its cube, 6041386745806307792718212890624, ends in 18212890624.

It is not an unprimeable number, because it can be changed into a prime (18212890621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4444459 + ... + 4448554.

Almost surely, 2^18212890624 is an apocalyptic number.

It is an amenable number.

18212890624 is a deficient number, since it is larger than the sum of its proper divisors (18204001706).

18212890624 is an frugal number, since it uses more digits than its factorization.

18212890624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8893035 (or 8893015 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

It can be divided in two parts, 1 and 8212890624, that added together give a square (8212890625 = 90625²).

The spelling of 18212890624 in words is "eighteen billion, two hundred twelve million, eight hundred ninety thousand, six hundred twenty-four".