25661207 has 16 divisors (see below), whose sum is σ = 30387840. Its totient is φ = 21362400.

The previous prime is 25661189. The next prime is 25661221. The reversal of 25661207 is 70216652.

It is a cyclic number.

It is not a de Polignac number, because 25661207 - 2⁸ = 25660951 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 25661207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19232 + ... + 20522.

It is an arithmetic number, because the mean of its divisors is an integer number (1899240).

Almost surely, 2^25661207 is an apocalyptic number.

25661207 is a deficient number, since it is larger than the sum of its proper divisors (4726633).

25661207 is a wasteful number, since it uses less digits than its factorization.

25661207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 25661207 is about 5065.6891929924. The cubic root of 25661207 is about 294.9572168158.

Adding to 25661207 its reverse (70216652), we get a palindrome (95877859).

It can be divided in two parts, 2566 and 1207, that added together give a palindrome (3773).

The spelling of 25661207 in words is "twenty-five million, six hundred sixty-one thousand, two hundred seven".