25961917066 has 8 divisors (see below), whose sum is σ = 38944355904. Its totient is φ = 12980465100.

The previous prime is 25961917043. The next prime is 25961917067. The reversal of 25961917066 is 66071916952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25961917066² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25961917067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177010 + ... + 288541.

It is an arithmetic number, because the mean of its divisors is an integer number (4868044488).

Almost surely, 2^25961917066 is an apocalyptic number.

25961917066 is a deficient number, since it is larger than the sum of its proper divisors (12982438838).

25961917066 is a wasteful number, since it uses less digits than its factorization.

25961917066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493436.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 25961917066 in words is "twenty-five billion, nine hundred sixty-one million, nine hundred seventeen thousand, sixty-six".