25567690201 has 3 divisors (see below), whose sum is σ = 25567850101. Its totient is φ = 25567530302.

The previous prime is 25567690193. The next prime is 25567690207. The reversal of 25567690201 is 10209676552.

The square root of 25567690201 is 159899.

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 is not a de Polignac number, because 25567690201 - 2³ = 25567690193 is a prime.

It is a super-2 number, since 2×25567690201² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25567690207) 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, 79950 + ... + 239848.

Almost surely, 2^25567690201 is an apocalyptic number.

25567690201 is the 159899-th square number.

25567690201 is the 79950-th centered octagonal number.

It is an amenable number.

25567690201 is a deficient number, since it is larger than the sum of its proper divisors (159900).

25567690201 is an frugal number, since it uses more digits than its factorization.

25567690201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319798 (or 159899 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 25567690201 in words is "twenty-five billion, five hundred sixty-seven million, six hundred ninety thousand, two hundred one".