25859199861 has 80 divisors (see below), whose sum is σ = 44460820800. Its totient is φ = 14813280000.

The previous prime is 25859199853. The next prime is 25859199881. The reversal of 25859199861 is 16899195852.

It is not a de Polignac number, because 25859199861 - 2³ = 25859199853 is a prime.

It is a super-2 number, since 2×25859199861² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25859199881) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8615361 + ... + 8618361.

It is an arithmetic number, because the mean of its divisors is an integer number (555760260).

Almost surely, 2^25859199861 is an apocalyptic number.

It is an amenable number.

25859199861 is a deficient number, since it is larger than the sum of its proper divisors (18601620939).

25859199861 is a wasteful number, since it uses less digits than its factorization.

25859199861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3552 (or 3543 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 63.

The spelling of 25859199861 in words is "twenty-five billion, eight hundred fifty-nine million, one hundred ninety-nine thousand, eight hundred sixty-one".