25945993165 has 16 divisors (see below), whose sum is σ = 31231234800. Its totient is φ = 20692867072.

The previous prime is 25945993163. The next prime is 25945993201. The reversal of 25945993165 is 56139954952.

It can be written as a sum of positive squares in 8 ways, for example, as 730458729 + 25215534436 = 27027^2 + 158794^2 .

It is a cyclic number.

It is not a de Polignac number, because 25945993165 - 2¹ = 25945993163 is a prime.

It is a super-2 number, since 2×25945993165² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25945993163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2295969 + ... + 2307241.

It is an arithmetic number, because the mean of its divisors is an integer number (1951952175).

Almost surely, 2^25945993165 is an apocalyptic number.

It is an amenable number.

25945993165 is a deficient number, since it is larger than the sum of its proper divisors (5285241635).

25945993165 is a wasteful number, since it uses less digits than its factorization.

25945993165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12656.

The product of its digits is 13122000, while the sum is 58.

The spelling of 25945993165 in words is "twenty-five billion, nine hundred forty-five million, nine hundred ninety-three thousand, one hundred sixty-five".