25855289465 has 16 divisors (see below), whose sum is σ = 31382814096. Its totient is φ = 20447232000.

The previous prime is 25855289441. The next prime is 25855289489. The reversal of 25855289465 is 56498255852.

It is an interprime number because it is at equal distance from previous prime (25855289441) and next prime (25855289489).

It can be written as a sum of positive squares in 8 ways, for example, as 1194670096 + 24660619369 = 34564^2 + 157037^2 .

It is not a de Polignac number, because 25855289465 - 2⁶ = 25855289401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283769 + ... + 363641.

It is an arithmetic number, because the mean of its divisors is an integer number (1961425881).

Almost surely, 2^25855289465 is an apocalyptic number.

It is an amenable number.

25855289465 is a deficient number, since it is larger than the sum of its proper divisors (5527524631).

25855289465 is a wasteful number, since it uses less digits than its factorization.

25855289465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80620.

The product of its digits is 34560000, while the sum is 59.

The spelling of 25855289465 in words is "twenty-five billion, eight hundred fifty-five million, two hundred eighty-nine thousand, four hundred sixty-five".