18990375257 has 8 divisors (see below), whose sum is σ = 21731368896. Its totient is φ = 16256402352.

The previous prime is 18990375199. The next prime is 18990375289. The reversal of 18990375257 is 75257309981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18990375257 - 2¹⁰ = 18990374233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18990377257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1749383 + ... + 1760204.

It is an arithmetic number, because the mean of its divisors is an integer number (2716421112).

Almost surely, 2^18990375257 is an apocalyptic number.

It is an amenable number.

18990375257 is a deficient number, since it is larger than the sum of its proper divisors (2740993639).

18990375257 is an equidigital number, since it uses as much as digits as its factorization.

18990375257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510367.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 18990375257 in words is "eighteen billion, nine hundred ninety million, three hundred seventy-five thousand, two hundred fifty-seven".