253666553 has 4 divisors (see below), whose sum is σ = 289904640. Its totient is φ = 217428468.

The previous prime is 253666541. The next prime is 253666559. The reversal of 253666553 is 355666352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253666553 - 2⁸ = 253666297 is a prime.

It is a super-2 number, since 2×253666553² = 128693440221803618, which 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 253666553.

It is not an unprimeable number, because it can be changed into a prime (253666559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18119033 + ... + 18119046.

It is an arithmetic number, because the mean of its divisors is an integer number (72476160).

Almost surely, 2^253666553 is an apocalyptic number.

It is an amenable number.

253666553 is a deficient number, since it is larger than the sum of its proper divisors (36238087).

253666553 is an equidigital number, since it uses as much as digits as its factorization.

253666553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36238086.

The product of its digits is 486000, while the sum is 41.

The square root of 253666553 is about 15926.9128521506. The cubic root of 253666553 is about 633.0253020707.

The spelling of 253666553 in words is "two hundred fifty-three million, six hundred sixty-six thousand, five hundred fifty-three".