253644661 has 8 divisors (see below), whose sum is σ = 267322400. Its totient is φ = 239999760.

The previous prime is 253644631. The next prime is 253644691. The reversal of 253644661 is 166446352.

It is an interprime number because it is at equal distance from previous prime (253644631) and next prime (253644691).

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

It is a cyclic number.

It is not a de Polignac number, because 253644661 - 2¹³ = 253636469 is a prime.

It is a super-2 number, since 2×253644661² = 128671228107609842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 253644661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253644631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8551 + ... + 24091.

It is an arithmetic number, because the mean of its divisors is an integer number (33415300).

Almost surely, 2^253644661 is an apocalyptic number.

It is an amenable number.

253644661 is a deficient number, since it is larger than the sum of its proper divisors (13677739).

253644661 is a wasteful number, since it uses less digits than its factorization.

253644661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16419.

The product of its digits is 103680, while the sum is 37.

The square root of 253644661 is about 15926.2255729347. The cubic root of 253644661 is about 633.0070910394.

The spelling of 253644661 in words is "two hundred fifty-three million, six hundred forty-four thousand, six hundred sixty-one".