253540163665 has 8 divisors (see below), whose sum is σ = 304250900328. Its totient is φ = 202830328320.

The previous prime is 253540163651. The next prime is 253540163683. The reversal of 253540163665 is 566361045352.

It can be written as a sum of positive squares in 4 ways, for example, as 71515060929 + 182025102736 = 267423^2 + 426644^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 253540163665 - 2⁷ = 253540163537 is a prime.

It is a super-2 number, since 2×253540163665² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 969895 + ... + 1203235.

It is an arithmetic number, because the mean of its divisors is an integer number (38031362541).

Almost surely, 2^253540163665 is an apocalyptic number.

It is an amenable number.

253540163665 is a deficient number, since it is larger than the sum of its proper divisors (50710736663).

253540163665 is a wasteful number, since it uses less digits than its factorization.

253540163665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450659.

The product of its (nonzero) digits is 1944000, while the sum is 46.

The spelling of 253540163665 in words is "two hundred fifty-three billion, five hundred forty million, one hundred sixty-three thousand, six hundred sixty-five".