25645997697 has 8 divisors (see below), whose sum is σ = 34839846144. Its totient is φ = 16774740528.

The previous prime is 25645997677. The next prime is 25645997723. The reversal of 25645997697 is 79679954652.

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

It is not a de Polignac number, because 25645997697 - 2¹² = 25645993601 is a prime.

It is a super-3 number, since 3×25645997697³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25645997677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80647633 + ... + 80647950.

It is an arithmetic number, because the mean of its divisors is an integer number (4354980768).

Almost surely, 2^25645997697 is an apocalyptic number.

It is an amenable number.

25645997697 is a deficient number, since it is larger than the sum of its proper divisors (9193848447).

25645997697 is a wasteful number, since it uses less digits than its factorization.

25645997697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161295639.

The product of its digits is 257191200, while the sum is 69.

The spelling of 25645997697 in words is "twenty-five billion, six hundred forty-five million, nine hundred ninety-seven thousand, six hundred ninety-seven".