18821626825 has 12 divisors (see below), whose sum is σ = 23366077020. Its totient is φ = 15039714560.

The previous prime is 18821626819. The next prime is 18821626847. The reversal of 18821626825 is 52862612881.

It can be written as a sum of positive squares in 6 ways, for example, as 11778624 + 18809848201 = 3432^2 + 137149^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18821626825 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417820 + ... + 460669.

It is an arithmetic number, because the mean of its divisors is an integer number (1947173085).

Almost surely, 2^18821626825 is an apocalyptic number.

It is an amenable number.

18821626825 is a deficient number, since it is larger than the sum of its proper divisors (4544450195).

18821626825 is an equidigital number, since it uses as much as digits as its factorization.

18821626825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879356 (or 879351 counting only the distinct ones).

The product of its digits is 737280, while the sum is 49.

The spelling of 18821626825 in words is "eighteen billion, eight hundred twenty-one million, six hundred twenty-six thousand, eight hundred twenty-five".