25666666669 has 8 divisors (see below), whose sum is σ = 29352605760. Its totient is φ = 21985545696.

The previous prime is 25666666651. The next prime is 25666666693. The reversal of 25666666669 is 96666666652.

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

It is a cyclic number.

It is not a de Polignac number, because 25666666669 - 2¹⁷ = 25666535597 is a prime.

It is a super-4 number, since 4×25666666669⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 25666666669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666666609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1193104 + ... + 1214425.

It is an arithmetic number, because the mean of its divisors is an integer number (3669075720).

Almost surely, 2^25666666669 is an apocalyptic number.

It is an amenable number.

25666666669 is a deficient number, since it is larger than the sum of its proper divisors (3685939091).

25666666669 is a wasteful number, since it uses less digits than its factorization.

25666666669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409059.

The product of its digits is 151165440, while the sum is 64.

The spelling of 25666666669 in words is "twenty-five billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-nine".