25487768646689 has 4 divisors (see below), whose sum is σ = 25487781100224. Its totient is φ = 25487756193156.

The previous prime is 25487768646677. The next prime is 25487768646719. The reversal of 25487768646689 is 98664686778452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25487768646689 - 2²⁴ = 25487751869473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25487768646689.

It is not an unprimeable number, because it can be changed into a prime (25487768648689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2353877 + ... + 7517730.

It is an arithmetic number, because the mean of its divisors is an integer number (6371945275056).

Almost surely, 2^{25487768646689} is an apocalyptic number.

It is an amenable number.

25487768646689 is a deficient number, since it is larger than the sum of its proper divisors (12453535).

25487768646689 is an equidigital number, since it uses as much as digits as its factorization.

25487768646689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12453534.

The product of its digits is 46820229120, while the sum is 86.

The spelling of 25487768646689 in words is "twenty-five trillion, four hundred eighty-seven billion, seven hundred sixty-eight million, six hundred forty-six thousand, six hundred eighty-nine".