25656631201 has 4 divisors (see below), whose sum is σ = 25766745732. Its totient is φ = 25546516672.

The previous prime is 25656631199. The next prime is 25656631207. The reversal of 25656631201 is 10213665652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2867709601 + 22788921600 = 53551^2 + 150960^2 .

It is a cyclic number.

It is not a de Polignac number, because 25656631201 - 2¹ = 25656631199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25656631207) 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, 55056916 + ... + 55057381.

It is an arithmetic number, because the mean of its divisors is an integer number (6441686433).

Almost surely, 2^25656631201 is an apocalyptic number.

It is an amenable number.

25656631201 is a deficient number, since it is larger than the sum of its proper divisors (110114531).

25656631201 is a wasteful number, since it uses less digits than its factorization.

25656631201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110114530.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 25656631201 in words is "twenty-five billion, six hundred fifty-six million, six hundred thirty-one thousand, two hundred one".