25505501 has 8 divisors (see below), whose sum is σ = 29196864. Its totient is φ = 21826080.

The previous prime is 25505497. The next prime is 25505509. The reversal of 25505501 is 10550552.

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 25505501 - 2² = 25505497 is a prime.

It is a super-2 number, since 2×25505501² = 1301061162522002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505509) 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, 2201 + ... + 7473.

It is an arithmetic number, because the mean of its divisors is an integer number (3649608).

Almost surely, 2^25505501 is an apocalyptic number.

It is an amenable number.

25505501 is a deficient number, since it is larger than the sum of its proper divisors (3691363).

25505501 is an equidigital number, since it uses as much as digits as its factorization.

25505501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5971.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 25505501 is about 5050.2971199722. The cubic root of 25505501 is about 294.3594297446.

The spelling of 25505501 in words is "twenty-five million, five hundred five thousand, five hundred one".