25949972177381 has 16 divisors (see below), whose sum is σ = 29665427433600. Its totient is φ = 22236596782848.

The previous prime is 25949972177369. The next prime is 25949972177399. The reversal of 25949972177381 is 18377127994952.

It is not a de Polignac number, because 25949972177381 - 2⁴² = 21551925666277 is a prime.

It is a super-2 number, since 2×25949972177381² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (74) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25949972177299 and 25949972177308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25949972177281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636960710 + ... + 637001448.

It is an arithmetic number, because the mean of its divisors is an integer number (1854089214600).

Almost surely, 2^{25949972177381} is an apocalyptic number.

It is an amenable number.

25949972177381 is a deficient number, since it is larger than the sum of its proper divisors (3715455256219).

25949972177381 is a wasteful number, since it uses less digits than its factorization.

25949972177381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64028.

The product of its digits is 480090240, while the sum is 74.

The spelling of 25949972177381 in words is "twenty-five trillion, nine hundred forty-nine billion, nine hundred seventy-two million, one hundred seventy-seven thousand, three hundred eighty-one".