25537622065 has 4 divisors (see below), whose sum is σ = 30645146484. Its totient is φ = 20430097648.

The previous prime is 25537622059. The next prime is 25537622069. The reversal of 25537622065 is 56022673552.

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 2854551184 + 22683070881 = 53428^2 + 150609^2 .

It is a cyclic number.

It is not a de Polignac number, because 25537622065 - 2³¹ = 23390138417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25537622069) 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, 2553762202 + ... + 2553762211.

It is an arithmetic number, because the mean of its divisors is an integer number (7661286621).

Almost surely, 2^25537622065 is an apocalyptic number.

It is an amenable number.

25537622065 is a deficient number, since it is larger than the sum of its proper divisors (5107524419).

25537622065 is an equidigital number, since it uses as much as digits as its factorization.

25537622065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107524418.

The product of its (nonzero) digits is 756000, while the sum is 43.

The spelling of 25537622065 in words is "twenty-five billion, five hundred thirty-seven million, six hundred twenty-two thousand, sixty-five".