25952021901 has 24 divisors (see below), whose sum is σ = 40396155800. Its totient is φ = 15960053376.

The previous prime is 25952021881. The next prime is 25952021933. The reversal of 25952021901 is 10912025952.

It is a happy number.

25952021901 is a `hidden beast` number, since 25 + 9 + 520 + 21 + 90 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1630059876 + 24321962025 = 40374^2 + 155955^2 .

It is not a de Polignac number, because 25952021901 - 2⁵ = 25952021869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25952021941) 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, 109635 + ... + 252831.

Almost surely, 2^25952021901 is an apocalyptic number.

It is an amenable number.

25952021901 is a deficient number, since it is larger than the sum of its proper divisors (14444133899).

25952021901 is a wasteful number, since it uses less digits than its factorization.

25952021901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144765 (or 144762 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 25952021901 in words is "twenty-five billion, nine hundred fifty-two million, twenty-one thousand, nine hundred one".