25971879882861 has 24 divisors (see below), whose sum is σ = 42441141541344. Its totient is φ = 15740533260720.

The previous prime is 25971879882857. The next prime is 25971879882887. The reversal of 25971879882861 is 16828897817952.

25971879882861 is a `hidden beast` number, since 2 + 597 + 18 + 7 + 9 + 8 + 8 + 2 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 25971879882861 - 2² = 25971879882857 is a prime.

It is a super-2 number, since 2×25971879882861² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25971879882841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4858186606 + ... + 4858191951.

It is an arithmetic number, because the mean of its divisors is an integer number (1768380897556).

Almost surely, 2^{25971879882861} is an apocalyptic number.

It is an amenable number.

25971879882861 is a deficient number, since it is larger than the sum of its proper divisors (16469261658483).

25971879882861 is an equidigital number, since it uses as much as digits as its factorization.

25971879882861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9716378583 (or 9716378571 counting only the distinct ones).

The product of its digits is 1950842880, while the sum is 81.

The spelling of 25971879882861 in words is "twenty-five trillion, nine hundred seventy-one billion, eight hundred seventy-nine million, eight hundred eighty-two thousand, eight hundred sixty-one".