25717540536561 has 8 divisors (see below), whose sum is σ = 34291506926880. Its totient is φ = 17144300585312.

The previous prime is 25717540536511. The next prime is 25717540536593. The reversal of 25717540536561 is 16563504571752.

It is a happy number.

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 25717540536561 - 2²² = 25717536342257 is a prime.

It is a super-2 number, since 2×25717540536561² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25717540536511) 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, 181527156 + ... + 181668773.

It is an arithmetic number, because the mean of its divisors is an integer number (4286438365860).

Almost surely, 2^{25717540536561} is an apocalyptic number.

It is an amenable number.

25717540536561 is a deficient number, since it is larger than the sum of its proper divisors (8573966390319).

25717540536561 is a wasteful number, since it uses less digits than its factorization.

25717540536561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363219535.

The product of its (nonzero) digits is 26460000, while the sum is 57.

The spelling of 25717540536561 in words is "twenty-five trillion, seven hundred seventeen billion, five hundred forty million, five hundred thirty-six thousand, five hundred sixty-one".