2561401807 has 2 divisors, whose sum is σ = 2561401808. Its totient is φ = 2561401806.

The previous prime is 2561401793. The next prime is 2561401813. The reversal of 2561401807 is 7081041652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561401807 - 2¹¹ = 2561399759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561401847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280700903 + 1280700904.

It is an arithmetic number, because the mean of its divisors is an integer number (1280700904).

Almost surely, 2^2561401807 is an apocalyptic number.

2561401807 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561401807 is an equidigital number, since it uses as much as digits as its factorization.

2561401807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 2561401807 is about 50610.2934885780. The cubic root of 2561401807 is about 1368.2304051390.

The spelling of 2561401807 in words is "two billion, five hundred sixty-one million, four hundred one thousand, eight hundred seven".