25071820209 has 24 divisors (see below), whose sum is σ = 36803518752. Its totient is φ = 16444529280.

The previous prime is 25071820159. The next prime is 25071820237. The reversal of 25071820209 is 90202817052.

It is not a de Polignac number, because 25071820209 - 2¹⁵ = 25071787441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25071820909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110394 + ... + 249660.

It is an arithmetic number, because the mean of its divisors is an integer number (1533479948).

Almost surely, 2^25071820209 is an apocalyptic number.

It is an amenable number.

25071820209 is a deficient number, since it is larger than the sum of its proper divisors (11731698543).

25071820209 is a wasteful number, since it uses less digits than its factorization.

25071820209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139597 (or 139594 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 25071820209 in words is "twenty-five billion, seventy-one million, eight hundred twenty thousand, two hundred nine".