253655643563 has 24 divisors (see below), whose sum is σ = 296279439984. Its totient is φ = 216527942400.

The previous prime is 253655643559. The next prime is 253655643583. The reversal of 253655643563 is 365346556352.

It is not a de Polignac number, because 253655643563 - 2² = 253655643559 is a prime.

It is a super-2 number, since 2×253655643563² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253655643583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33606356 + ... + 33613902.

It is an arithmetic number, because the mean of its divisors is an integer number (12344976666).

Almost surely, 2^253655643563 is an apocalyptic number.

253655643563 is a deficient number, since it is larger than the sum of its proper divisors (42623796421).

253655643563 is a wasteful number, since it uses less digits than its factorization.

253655643563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10283 (or 10276 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 53.

The spelling of 253655643563 in words is "two hundred fifty-three billion, six hundred fifty-five million, six hundred forty-three thousand, five hundred sixty-three".