25497661 has 8 divisors (see below), whose sum is σ = 29176704. Its totient is φ = 21827760.

The previous prime is 25497653. The next prime is 25497673. The reversal of 25497661 is 16679452.

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 25497661 - 2³ = 25497653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25497361) 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, 5451 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (3647088).

Almost surely, 2^25497661 is an apocalyptic number.

It is an amenable number.

25497661 is a deficient number, since it is larger than the sum of its proper divisors (3679043).

25497661 is a wasteful number, since it uses less digits than its factorization.

25497661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571.

The product of its digits is 90720, while the sum is 40.

The square root of 25497661 is about 5049.5208683597. The cubic root of 25497661 is about 294.3292661284.

The spelling of 25497661 in words is "twenty-five million, four hundred ninety-seven thousand, six hundred sixty-one".