25765105861931 has 16 divisors (see below), whose sum is σ = 27565261549056. Its totient is φ = 24023890214016.

The previous prime is 25765105861903. The next prime is 25765105861969. The reversal of 25765105861931 is 13916850156752.

It is a cyclic number.

It is not a de Polignac number, because 25765105861931 - 2¹⁸ = 25765105599787 is a prime.

It is a super-2 number, since 2×25765105861931² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25765105861981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25398830 + ... + 26393763.

It is an arithmetic number, because the mean of its divisors is an integer number (1722828846816).

Almost surely, 2^{25765105861931} is an apocalyptic number.

25765105861931 is a deficient number, since it is larger than the sum of its proper divisors (1800155687125).

25765105861931 is a wasteful number, since it uses less digits than its factorization.

25765105861931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51793162.

The product of its (nonzero) digits is 13608000, while the sum is 59.

The spelling of 25765105861931 in words is "twenty-five trillion, seven hundred sixty-five billion, one hundred five million, eight hundred sixty-one thousand, nine hundred thirty-one".