25773412681 has 3 divisors (see below), whose sum is σ = 25773573223. Its totient is φ = 25773252140.

The previous prime is 25773412673. The next prime is 25773412727. The reversal of 25773412681 is 18621437752.

The square root of 25773412681 is 160541.

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., 16063281081 + 9710131600 = 126741^2 + 98540^2 .

It is not a de Polignac number, because 25773412681 - 2³ = 25773412673 is a prime.

It is a super-2 number, since 2×25773412681² (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 (25773412601) 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, 80271 + ... + 240811.

Almost surely, 2^25773412681 is an apocalyptic number.

25773412681 is the 160541-st square number.

25773412681 is the 80271-st centered octagonal number.

It is an amenable number.

25773412681 is a deficient number, since it is larger than the sum of its proper divisors (160542).

25773412681 is an frugal number, since it uses more digits than its factorization.

25773412681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321082 (or 160541 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The spelling of 25773412681 in words is "twenty-five billion, seven hundred seventy-three million, four hundred twelve thousand, six hundred eighty-one".