25700449917 has 4 divisors (see below), whose sum is σ = 34267266560. Its totient is φ = 17133633276.

The previous prime is 25700449913. The next prime is 25700449961. The reversal of 25700449917 is 71994400752.

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.

It is not a de Polignac number, because 25700449917 - 2² = 25700449913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25700449913) 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, 4283408317 + ... + 4283408322.

It is an arithmetic number, because the mean of its divisors is an integer number (8566816640).

Almost surely, 2^25700449917 is an apocalyptic number.

It is an amenable number.

25700449917 is a deficient number, since it is larger than the sum of its proper divisors (8566816643).

25700449917 is an equidigital number, since it uses as much as digits as its factorization.

25700449917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566816642.

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 25700449917 in words is "twenty-five billion, seven hundred million, four hundred forty-nine thousand, nine hundred seventeen".