25213318209 has 12 divisors (see below), whose sum is σ = 36421955856. Its totient is φ = 16807624152.

The previous prime is 25213318201. The next prime is 25213318211. The reversal of 25213318209 is 90281331252.

It is not a de Polignac number, because 25213318209 - 2³ = 25213318201 is a prime.

It is a super-2 number, since 2×25213318209² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25213318201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32122 + ... + 226844.

It is an arithmetic number, because the mean of its divisors is an integer number (3035162988).

Almost surely, 2^25213318209 is an apocalyptic number.

It is an amenable number.

25213318209 is a deficient number, since it is larger than the sum of its proper divisors (11208637647).

25213318209 is a wasteful number, since it uses less digits than its factorization.

25213318209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209116 (or 209113 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 25213318209 in words is "twenty-five billion, two hundred thirteen million, three hundred eighteen thousand, two hundred nine".