2504645681 has 2 divisors, whose sum is σ = 2504645682. Its totient is φ = 2504645680.

The previous prime is 2504645659. The next prime is 2504645701. The reversal of 2504645681 is 1865464052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2051637025 + 453008656 = 45295^2 + 21284^2 .

It is a cyclic number.

It is not a de Polignac number, because 2504645681 - 2²² = 2500451377 is a prime.

It is a super-2 number, since 2×2504645681² = 12546499974703907522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2504645981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252322840 + 1252322841.

It is an arithmetic number, because the mean of its divisors is an integer number (1252322841).

Almost surely, 2^2504645681 is an apocalyptic number.

It is an amenable number.

2504645681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2504645681 is an equidigital number, since it uses as much as digits as its factorization.

2504645681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 2504645681 is about 50046.4352476777. The cubic root of 2504645681 is about 1358.0489759819.

The spelling of 2504645681 in words is "two billion, five hundred four million, six hundred forty-five thousand, six hundred eighty-one".