25963199161 has 9 divisors (see below), whose sum is σ = 26103654031. Its totient is φ = 25823498584.

The previous prime is 25963199137. The next prime is 25963199177. The reversal of 25963199161 is 16199136952.

It is a happy number.

The square root of 25963199161 is 161131.

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

It can be written as a sum of positive squares in only one way, i.e., 1708251561 + 24254947600 = 41331^2 + 155740^2 .

It is not a de Polignac number, because 25963199161 - 2²¹ = 25961102009 is a prime.

It is a super-2 number, since 2×25963199161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25963199099 and 25963199108.

It is not an unprimeable number, because it can be changed into a prime (25963199761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43343940 + ... + 43344538.

Almost surely, 2^25963199161 is an apocalyptic number.

25963199161 is the 161131-st square number.

25963199161 is the 80566-th centered octagonal number.

It is an amenable number.

25963199161 is a deficient number, since it is larger than the sum of its proper divisors (140454870).

25963199161 is an frugal number, since it uses more digits than its factorization.

25963199161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 868 counting only the distinct ones).

The product of its digits is 787320, while the sum is 52.

The spelling of 25963199161 in words is "twenty-five billion, nine hundred sixty-three million, one hundred ninety-nine thousand, one hundred sixty-one".