251223454553 has 4 divisors (see below), whose sum is σ = 251224524468. Its totient is φ = 251222384640.

The previous prime is 251223454549. The next prime is 251223454619. The reversal of 251223454553 is 355454322152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26597695744 + 224625758809 = 163088^2 + 473947^2 .

It is a cyclic number.

It is not a de Polignac number, because 251223454553 - 2² = 251223454549 is a prime.

It is a super-2 number, since 2×251223454553² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251223454553.

It is not an unprimeable number, because it can be changed into a prime (251223454513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12968 + ... + 708953.

It is an arithmetic number, because the mean of its divisors is an integer number (62806131117).

Almost surely, 2^251223454553 is an apocalyptic number.

It is an amenable number.

251223454553 is a deficient number, since it is larger than the sum of its proper divisors (1069915).

251223454553 is an equidigital number, since it uses as much as digits as its factorization.

251223454553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069914.

The product of its digits is 720000, while the sum is 41.

The spelling of 251223454553 in words is "two hundred fifty-one billion, two hundred twenty-three million, four hundred fifty-four thousand, five hundred fifty-three".