25115522120665 has 12 divisors (see below), whose sum is σ = 30407700427884. Its totient is φ = 19914608639744.

The previous prime is 25115522120629. The next prime is 25115522120797. The reversal of 25115522120665 is 56602122551152.

It can be written as a sum of positive squares in 6 ways, for example, as 3095252604889 + 22020269515776 = 1759333^2 + 4692576^2 .

It is not a de Polignac number, because 25115522120665 - 2³⁹ = 24565766306777 is a prime.

It is a super-2 number, since 2×25115522120665² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196627534 + ... + 196755223.

It is an arithmetic number, because the mean of its divisors is an integer number (2533975035657).

Almost surely, 2^{25115522120665} is an apocalyptic number.

It is an amenable number.

25115522120665 is a deficient number, since it is larger than the sum of its proper divisors (5292178307219).

25115522120665 is an equidigital number, since it uses as much as digits as its factorization.

25115522120665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393382988 (or 393382875 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 25115522120665 in words is "twenty-five trillion, one hundred fifteen billion, five hundred twenty-two million, one hundred twenty thousand, six hundred sixty-five".