25917278461 has 16 divisors (see below), whose sum is σ = 26666478720. Its totient is φ = 25180323840.

The previous prime is 25917278459. The next prime is 25917278483. The reversal of 25917278461 is 16487271952.

It is a cyclic number.

It is not a de Polignac number, because 25917278461 - 2¹ = 25917278459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25917278399 and 25917278408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25917278441) 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, 2404861 + ... + 2415613.

It is an arithmetic number, because the mean of its divisors is an integer number (1666654920).

Almost surely, 2^25917278461 is an apocalyptic number.

It is an amenable number.

25917278461 is a deficient number, since it is larger than the sum of its proper divisors (749200259).

25917278461 is a wasteful number, since it uses less digits than its factorization.

25917278461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11316.

The product of its digits is 1693440, while the sum is 52.

The spelling of 25917278461 in words is "twenty-five billion, nine hundred seventeen million, two hundred seventy-eight thousand, four hundred sixty-one".