25906706165 has 16 divisors (see below), whose sum is σ = 31637883312. Its totient is φ = 20361928704.

The previous prime is 25906706149. The next prime is 25906706171. The reversal of 25906706165 is 56160760952.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 12103441 + 25894602724 = 3479^2 + 160918^2 .

It is a cyclic number.

It is not a de Polignac number, because 25906706165 - 2⁴ = 25906706149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128504 + ... + 261393.

It is an arithmetic number, because the mean of its divisors is an integer number (1977367707).

Almost surely, 2^25906706165 is an apocalyptic number.

It is an amenable number.

25906706165 is a deficient number, since it is larger than the sum of its proper divisors (5731177147).

25906706165 is a wasteful number, since it uses less digits than its factorization.

25906706165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390136.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 25906706165 in words is "twenty-five billion, nine hundred six million, seven hundred six thousand, one hundred sixty-five".