25666436376 has 144 divisors (see below), whose sum is σ = 81200588040. Its totient is φ = 7302597120.

The previous prime is 25666436371. The next prime is 25666436423. The reversal of 25666436376 is 67363466652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666436371) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 835155 + ... + 865341.

Almost surely, 2^25666436376 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 25666436376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40600294020).

25666436376 is an abundant number, since it is smaller than the sum of its proper divisors (55534151664).

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

25666436376 is a wasteful number, since it uses less digits than its factorization.

25666436376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30454 (or 30440 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 54.

The spelling of 25666436376 in words is "twenty-five billion, six hundred sixty-six million, four hundred thirty-six thousand, three hundred seventy-six".