18501009425 has 6 divisors (see below), whose sum is σ = 22941251718. Its totient is φ = 14800807520.

The previous prime is 18501009421. The next prime is 18501009427. The reversal of 18501009425 is 52490010581.

It can be written as a sum of positive squares in 3 ways, for example, as 5557851601 + 12943157824 = 74551^2 + 113768^2 .

It is not a de Polignac number, because 18501009425 - 2² = 18501009421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18501009421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 370020164 + ... + 370020213.

It is an arithmetic number, because the mean of its divisors is an integer number (3823541953).

Almost surely, 2^18501009425 is an apocalyptic number.

It is an amenable number.

18501009425 is a deficient number, since it is larger than the sum of its proper divisors (4440242293).

18501009425 is an equidigital number, since it uses as much as digits as its factorization.

18501009425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740040387 (or 740040382 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 18501009425 in words is "eighteen billion, five hundred one million, nine thousand, four hundred twenty-five".