25566666552 has 128 divisors (see below), whose sum is σ = 81302400000. Its totient is φ = 7292308608.

The previous prime is 25566666547. The next prime is 25566666581.

25566666552 is nontrivially palindromic in base 10.

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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 891574 + ... + 919802.

It is an arithmetic number, because the mean of its divisors is an integer number (635175000).

Almost surely, 2^25566666552 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 25566666552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40651200000).

25566666552 is an abundant number, since it is smaller than the sum of its proper divisors (55735733448).

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

25566666552 is a wasteful number, since it uses less digits than its factorization.

25566666552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28850 (or 28840 counting only the distinct ones).

The product of its digits is 19440000, while the sum is 54.

The spelling of 25566666552 in words is "twenty-five billion, five hundred sixty-six million, six hundred sixty-six thousand, five hundred fifty-two".