25494661 has 4 divisors (see below), whose sum is σ = 26116524. Its totient is φ = 24872800.

The previous prime is 25494653. The next prime is 25494691. The reversal of 25494661 is 16649452.

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 2512225 + 22982436 = 1585^2 + 4794^2 .

It is a cyclic number.

It is not a de Polignac number, because 25494661 - 2³ = 25494653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25494661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25494691) 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, 310870 + ... + 310951.

It is an arithmetic number, because the mean of its divisors is an integer number (6529131).

Almost surely, 2^25494661 is an apocalyptic number.

It is an amenable number.

25494661 is a deficient number, since it is larger than the sum of its proper divisors (621863).

25494661 is an equidigital number, since it uses as much as digits as its factorization.

25494661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621862.

The product of its digits is 51840, while the sum is 37.

The square root of 25494661 is about 5049.2238017343. The cubic root of 25494661 is about 294.3177222927.

The spelling of 25494661 in words is "twenty-five million, four hundred ninety-four thousand, six hundred sixty-one".