25695438749 has 32 divisors (see below), whose sum is σ = 28444141440. Its totient is φ = 23112456192.

The previous prime is 25695438731. The next prime is 25695438757. The reversal of 25695438749 is 94783459652.

It is a cyclic number.

It is not a de Polignac number, because 25695438749 - 2³² = 21400471453 is a prime.

It is a super-2 number, since 2×25695438749² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25695438691 and 25695438700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25695438049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10047779 + ... + 10050335.

It is an arithmetic number, because the mean of its divisors is an integer number (888879420).

Almost surely, 2^25695438749 is an apocalyptic number.

It is an amenable number.

25695438749 is a deficient number, since it is larger than the sum of its proper divisors (2748702691).

25695438749 is a wasteful number, since it uses less digits than its factorization.

25695438749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909.

The product of its digits is 65318400, while the sum is 62.

The spelling of 25695438749 in words is "twenty-five billion, six hundred ninety-five million, four hundred thirty-eight thousand, seven hundred forty-nine".