25583961813 has 4 divisors (see below), whose sum is σ = 34111949088. Its totient is φ = 17055974540.

The previous prime is 25583961797. The next prime is 25583961881. The reversal of 25583961813 is 31816938552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25583961813 - 2⁴ = 25583961797 is a prime.

It is a super-4 number, since 4×25583961813⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25583961413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4263993633 + ... + 4263993638.

It is an arithmetic number, because the mean of its divisors is an integer number (8527987272).

Almost surely, 2^25583961813 is an apocalyptic number.

It is an amenable number.

25583961813 is a deficient number, since it is larger than the sum of its proper divisors (8527987275).

25583961813 is an equidigital number, since it uses as much as digits as its factorization.

25583961813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8527987274.

The product of its digits is 1555200, while the sum is 51.

The spelling of 25583961813 in words is "twenty-five billion, five hundred eighty-three million, nine hundred sixty-one thousand, eight hundred thirteen".