18751045985251 has 2 divisors, whose sum is σ = 18751045985252. Its totient is φ = 18751045985250.

The previous prime is 18751045985249. The next prime is 18751045985317. The reversal of 18751045985251 is 15258954015781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18751045985251 - 2¹ = 18751045985249 is a prime.

Together with 18751045985249, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18751045985251.

It is not a weakly prime, because it can be changed into another prime (18751045985351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375522992625 + 9375522992626.

It is an arithmetic number, because the mean of its divisors is an integer number (9375522992626).

Almost surely, 2^{18751045985251} is an apocalyptic number.

18751045985251 is a deficient number, since it is larger than the sum of its proper divisors (1).

18751045985251 is an equidigital number, since it uses as much as digits as its factorization.

18751045985251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160000, while the sum is 61.

The spelling of 18751045985251 in words is "eighteen trillion, seven hundred fifty-one billion, forty-five million, nine hundred eighty-five thousand, two hundred fifty-one".