25465661 has 4 divisors (see below), whose sum is σ = 27424572. Its totient is φ = 23506752.

The previous prime is 25465651. The next prime is 25465667. The reversal of 25465661 is 16656452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6708100 + 18757561 = 2590^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 25465661 - 2⁶ = 25465597 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 (25465667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979436 + ... + 979461.

It is an arithmetic number, because the mean of its divisors is an integer number (6856143).

Almost surely, 2^25465661 is an apocalyptic number.

It is an amenable number.

25465661 is a deficient number, since it is larger than the sum of its proper divisors (1958911).

25465661 is a wasteful number, since it uses less digits than its factorization.

25465661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958910.

The product of its digits is 43200, while the sum is 35.

The square root of 25465661 is about 5046.3512561057. The cubic root of 25465661 is about 294.2060851641.

The spelling of 25465661 in words is "twenty-five million, four hundred sixty-five thousand, six hundred sixty-one".