25280666676 has 120 divisors (see below), whose sum is σ = 69642779360. Its totient is φ = 7974676800.

The previous prime is 25280666659. The next prime is 25280666701. The reversal of 25280666676 is 67666608252.

It is a happy number.

It is a super-2 number, since 2×25280666676² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 7945806 + ... + 7948986.

Almost surely, 2^25280666676 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25280666676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34821389680).

25280666676 is an abundant number, since it is smaller than the sum of its proper divisors (44362112684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25280666676 is a wasteful number, since it uses less digits than its factorization.

25280666676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507 (or 4496 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 25280666676 in words is "twenty-five billion, two hundred eighty million, six hundred sixty-six thousand, six hundred seventy-six".