25027556401 has 3 divisors (see below), whose sum is σ = 25027714603. Its totient is φ = 25027398200.

The previous prime is 25027556347. The next prime is 25027556413. The reversal of 25027556401 is 10465572052.

The square root of 25027556401 is 158201.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 529046001 + 24498510400 = 23001^2 + 156520^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25027556401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25027566401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79101 + ... + 237301.

Almost surely, 2^25027556401 is an apocalyptic number.

25027556401 is the 158201-st square number.

25027556401 is the 79101-st centered octagonal number.

It is an amenable number.

25027556401 is a deficient number, since it is larger than the sum of its proper divisors (158202).

25027556401 is an frugal number, since it uses more digits than its factorization.

25027556401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316402 (or 158201 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 25027556401 in words is "twenty-five billion, twenty-seven million, five hundred fifty-six thousand, four hundred one".