18628778045625 has 80 divisors (see below), whose sum is σ = 34067401142016. Its totient is φ = 8976721320000.

The previous prime is 18628778045593. The next prime is 18628778045653. The reversal of 18628778045625 is 52654087782681.

It is not a de Polignac number, because 18628778045625 - 2⁵ = 18628778045593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18628778045625.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 591282 + ... + 6132468.

Almost surely, 2^{18628778045625} is an apocalyptic number.

18628778045625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18628778045625 is a deficient number, since it is larger than the sum of its proper divisors (15438623096391).

18628778045625 is a wasteful number, since it uses less digits than its factorization.

18628778045625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5541384 (or 5541369 counting only the distinct ones).

The product of its (nonzero) digits is 361267200, while the sum is 69.

The spelling of 18628778045625 in words is "eighteen trillion, six hundred twenty-eight billion, seven hundred seventy-eight million, forty-five thousand, six hundred twenty-five".