251153242553 has 4 divisors (see below), whose sum is σ = 254901798480. Its totient is φ = 247404686628.

The previous prime is 251153242541. The next prime is 251153242579. The reversal of 251153242553 is 355242351152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251153242553 - 2⁸ = 251153242297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251153242253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874277863 + ... + 1874277996.

It is an arithmetic number, because the mean of its divisors is an integer number (63725449620).

Almost surely, 2^251153242553 is an apocalyptic number.

It is an amenable number.

251153242553 is a deficient number, since it is larger than the sum of its proper divisors (3748555927).

251153242553 is an equidigital number, since it uses as much as digits as its factorization.

251153242553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748555926.

The product of its digits is 180000, while the sum is 38.

The spelling of 251153242553 in words is "two hundred fifty-one billion, one hundred fifty-three million, two hundred forty-two thousand, five hundred fifty-three".