25640027701 has 4 divisors (see below), whose sum is σ = 25640465004. Its totient is φ = 25639590400.

The previous prime is 25640027687. The next prime is 25640027731. The reversal of 25640027701 is 10772004652.

25640027701 = 113225² + 113226².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12820127076 + 12819900625 = 113226^2 + 113225^2 .

It is a cyclic number.

It is not a de Polignac number, because 25640027701 - 2¹⁷ = 25639896629 is a prime.

It is a super-2 number, since 2×25640027701² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640027731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114010 + ... + 253531.

It is an arithmetic number, because the mean of its divisors is an integer number (6410116251).

Almost surely, 2^25640027701 is an apocalyptic number.

25640027701 is the 113226-th centered square number.

It is an amenable number.

25640027701 is a deficient number, since it is larger than the sum of its proper divisors (437303).

25640027701 is an equidigital number, since it uses as much as digits as its factorization.

25640027701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437302.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 25640027701 in words is "twenty-five billion, six hundred forty million, twenty-seven thousand, seven hundred one".