253221662161 has 32 divisors (see below), whose sum is σ = 278858764800. Its totient is φ = 228511722240.

The previous prime is 253221662149. The next prime is 253221662173. The reversal of 253221662161 is 161266122352.

It is an interprime number because it is at equal distance from previous prime (253221662149) and next prime (253221662173).

It is a cyclic number.

It is not a de Polignac number, because 253221662161 - 2⁷ = 253221662033 is a prime.

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 253221662161.

It is not an unprimeable number, because it can be changed into a prime (253221662191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205703416 + ... + 205704646.

It is an arithmetic number, because the mean of its divisors is an integer number (8714336400).

Almost surely, 2^253221662161 is an apocalyptic number.

It is an amenable number.

253221662161 is a deficient number, since it is larger than the sum of its proper divisors (25637102639).

253221662161 is a wasteful number, since it uses less digits than its factorization.

253221662161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569.

The product of its digits is 51840, while the sum is 37.

The spelling of 253221662161 in words is "two hundred fifty-three billion, two hundred twenty-one million, six hundred sixty-two thousand, one hundred sixty-one".