253663555 has 4 divisors (see below), whose sum is σ = 304396272. Its totient is φ = 202930840.

The previous prime is 253663523. The next prime is 253663561. The reversal of 253663555 is 555366352.

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

It is not a de Polignac number, because 253663555 - 2⁵ = 253663523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25366351 + ... + 25366360.

It is an arithmetic number, because the mean of its divisors is an integer number (76099068).

Almost surely, 2^253663555 is an apocalyptic number.

253663555 is a deficient number, since it is larger than the sum of its proper divisors (50732717).

253663555 is an equidigital number, since it uses as much as digits as its factorization.

253663555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50732716.

The product of its digits is 405000, while the sum is 40.

The square root of 253663555 is about 15926.8187344491. The cubic root of 253663555 is about 633.0228082229.

The spelling of 253663555 in words is "two hundred fifty-three million, six hundred sixty-three thousand, five hundred fifty-five".