18487297025 has 12 divisors (see below), whose sum is σ = 23356782972. Its totient is φ = 14510783040.

The previous prime is 18487297007. The next prime is 18487297057. The reversal of 18487297025 is 52079278481.

It is a Cunningham number, because it is equal to 135968²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 18487297024 = 1^2 + 135968^2 .

It is not a de Polignac number, because 18487297025 - 2⁸ = 18487296769 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6975014 + ... + 6977663.

It is an arithmetic number, because the mean of its divisors is an integer number (1946398581).

Almost surely, 2^18487297025 is an apocalyptic number.

It is an amenable number.

18487297025 is a deficient number, since it is larger than the sum of its proper divisors (4869485947).

18487297025 is a wasteful number, since it uses less digits than its factorization.

18487297025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13952740 (or 13952735 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 18487297025 in words is "eighteen billion, four hundred eighty-seven million, two hundred ninety-seven thousand, twenty-five".