25820311969 has 3 divisors (see below), whose sum is σ = 25820472657. Its totient is φ = 25820151282.

The previous prime is 25820311963. The next prime is 25820311999. The reversal of 25820311969 is 96911302852.

The square root of 25820311969 is 160687.

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 25820311969 - 2²⁷ = 25686094241 is a prime.

It is a super-2 number, since 2×25820311969² (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 (25820311963) 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, 80344 + ... + 241030.

It is an arithmetic number, because the mean of its divisors is an integer number (8606824219).

Almost surely, 2^25820311969 is an apocalyptic number.

25820311969 is the 160687-th square number.

25820311969 is the 80344-th centered octagonal number.

It is an amenable number.

25820311969 is a deficient number, since it is larger than the sum of its proper divisors (160688).

25820311969 is an frugal number, since it uses more digits than its factorization.

25820311969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321374 (or 160687 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 25820311969 in words is "twenty-five billion, eight hundred twenty million, three hundred eleven thousand, nine hundred sixty-nine".