25715209969 has 4 divisors (see below), whose sum is σ = 26262342144. Its totient is φ = 25168077796.

The previous prime is 25715209967. The next prime is 25715209997. The reversal of 25715209969 is 96990251752.

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 a cyclic number.

It is not a de Polignac number, because 25715209969 - 2¹ = 25715209967 is a prime.

It is a super-2 number, since 2×25715209969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25715209967) 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, 273566017 + ... + 273566110.

It is an arithmetic number, because the mean of its divisors is an integer number (6565585536).

Almost surely, 2^25715209969 is an apocalyptic number.

It is an amenable number.

25715209969 is a deficient number, since it is larger than the sum of its proper divisors (547132175).

25715209969 is an equidigital number, since it uses as much as digits as its factorization.

25715209969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547132174.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The spelling of 25715209969 in words is "twenty-five billion, seven hundred fifteen million, two hundred nine thousand, nine hundred sixty-nine".