253661556 has 24 divisors (see below), whose sum is σ = 626693760. Its totient is φ = 79580032.

The previous prime is 253661543. The next prime is 253661557. The reversal of 253661556 is 655166352.

It is a super-2 number, since 2×253661556² = 128688369984682272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253661557) 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, 621516 + ... + 621923.

It is an arithmetic number, because the mean of its divisors is an integer number (26112240).

Almost surely, 2^253661556 is an apocalyptic number.

It is an amenable number.

253661556 is an abundant number, since it is smaller than the sum of its proper divisors (373032204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253661556 is a wasteful number, since it uses less digits than its factorization.

253661556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243463 (or 1243461 counting only the distinct ones).

The product of its digits is 162000, while the sum is 39.

The square root of 253661556 is about 15926.7559785413. The cubic root of 253661556 is about 633.0211453695.

The spelling of 253661556 in words is "two hundred fifty-three million, six hundred sixty-one thousand, five hundred fifty-six".