25958661 has 4 divisors (see below), whose sum is σ = 34611552. Its totient is φ = 17305772.

The previous prime is 25958659. The next prime is 25958663. The reversal of 25958661 is 16685952.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (25958659) and next prime (25958663).

It is a cyclic number.

It is not a de Polignac number, because 25958661 - 2¹ = 25958659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25958663) 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, 4326441 + ... + 4326446.

It is an arithmetic number, because the mean of its divisors is an integer number (8652888).

Almost surely, 2^25958661 is an apocalyptic number.

It is an amenable number.

25958661 is a deficient number, since it is larger than the sum of its proper divisors (8652891).

25958661 is an equidigital number, since it uses as much as digits as its factorization.

25958661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8652890.

The product of its digits is 129600, while the sum is 42.

The square root of 25958661 is about 5094.9642785794. The cubic root of 25958661 is about 296.0925150611.

The spelling of 25958661 in words is "twenty-five million, nine hundred fifty-eight thousand, six hundred sixty-one".