25731326065 has 8 divisors (see below), whose sum is σ = 31712121000. Its totient is φ = 20028707712.

The previous prime is 25731326059. The next prime is 25731326111. The reversal of 25731326065 is 56062313752.

It can be written as a sum of positive squares in 4 ways, for example, as 2393264241 + 23338061824 = 48921^2 + 152768^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25731326065 - 2²⁵ = 25697771633 is a prime.

It is a super-2 number, since 2×25731326065² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69543940 + ... + 69544309.

It is an arithmetic number, because the mean of its divisors is an integer number (3964015125).

Almost surely, 2^25731326065 is an apocalyptic number.

It is an amenable number.

25731326065 is a deficient number, since it is larger than the sum of its proper divisors (5980794935).

25731326065 is a wasteful number, since it uses less digits than its factorization.

25731326065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139088291.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 25731326065 in words is "twenty-five billion, seven hundred thirty-one million, three hundred twenty-six thousand, sixty-five".