253563120256 has 16 divisors (see below), whose sum is σ = 505145278890. Its totient is φ = 126781560064.

The previous prime is 253563120253. The next prime is 253563120281. The reversal of 253563120256 is 652021365352.

It can be written as a sum of positive squares in only one way, i.e., 248187297856 + 5375822400 = 498184^2 + 73320^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (253563120253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990480811 + ... + 990481066.

Almost surely, 2^253563120256 is an apocalyptic number.

It is an amenable number.

253563120256 is a deficient number, since it is larger than the sum of its proper divisors (251582158634).

253563120256 is an equidigital number, since it uses as much as digits as its factorization.

253563120256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980961891 (or 1980961879 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 253563120256 in words is "two hundred fifty-three billion, five hundred sixty-three million, one hundred twenty thousand, two hundred fifty-six".