253361662621 has 4 divisors (see below), whose sum is σ = 268265289852. Its totient is φ = 238458035392.

The previous prime is 253361662577. The next prime is 253361662661. The reversal of 253361662621 is 126266163352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113848207396 + 139513455225 = 337414^2 + 373515^2 .

It is a cyclic number.

It is not a de Polignac number, because 253361662621 - 2⁷ = 253361662493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253361662661) 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, 7451813590 + ... + 7451813623.

It is an arithmetic number, because the mean of its divisors is an integer number (67066322463).

Almost surely, 2^253361662621 is an apocalyptic number.

It is an amenable number.

253361662621 is a deficient number, since it is larger than the sum of its proper divisors (14903627231).

253361662621 is a wasteful number, since it uses less digits than its factorization.

253361662621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14903627230.

The product of its digits is 466560, while the sum is 43.

The spelling of 253361662621 in words is "two hundred fifty-three billion, three hundred sixty-one million, six hundred sixty-two thousand, six hundred twenty-one".