25566440501 has 8 divisors (see below), whose sum is σ = 29414889600. Its totient is φ = 21767016528.

The previous prime is 25566440443. The next prime is 25566440509. The reversal of 25566440501 is 10504466552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25566440501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25566440509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12255161 + ... + 12257246.

It is an arithmetic number, because the mean of its divisors is an integer number (3676861200).

Almost surely, 2^25566440501 is an apocalyptic number.

It is an amenable number.

25566440501 is a deficient number, since it is larger than the sum of its proper divisors (3848449099).

25566440501 is a wasteful number, since it uses less digits than its factorization.

25566440501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24512563.

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 25566440501 in words is "twenty-five billion, five hundred sixty-six million, four hundred forty thousand, five hundred one".