25645425345 has 24 divisors (see below), whose sum is σ = 44584002216. Its totient is φ = 13636965888.

The previous prime is 25645425329. The next prime is 25645425347. The reversal of 25645425345 is 54352454652.

25645425345 is a `hidden beast` number, since 2 + 5 + 64 + 54 + 2 + 534 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1544725809 + 24100699536 = 39303^2 + 155244^2 .

It is not a de Polignac number, because 25645425345 - 2⁴ = 25645425329 is a prime.

It is a super-2 number, since 2×25645425345² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 25645425345.

It is not an unprimeable number, because it can be changed into a prime (25645425347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 830382 + ... + 860711.

It is an arithmetic number, because the mean of its divisors is an integer number (1857666759).

Almost surely, 2^25645425345 is an apocalyptic number.

It is an amenable number.

25645425345 is a deficient number, since it is larger than the sum of its proper divisors (18938576871).

25645425345 is a wasteful number, since it uses less digits than its factorization.

25645425345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691441 (or 1691438 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 45.

Adding to 25645425345 its reverse (54352454652), we get a palindrome (79997879997).

The spelling of 25645425345 in words is "twenty-five billion, six hundred forty-five million, four hundred twenty-five thousand, three hundred forty-five".