25664426 has 4 divisors (see below), whose sum is σ = 38496642. Its totient is φ = 12832212.

The previous prime is 25664423. The next prime is 25664437. The reversal of 25664426 is 62446652.

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

It can be written as a sum of positive squares in only one way, i.e., 25654225 + 10201 = 5065^2 + 101^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25664423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6416105 + ... + 6416108.

Almost surely, 2^25664426 is an apocalyptic number.

25664426 is a deficient number, since it is larger than the sum of its proper divisors (12832216).

25664426 is a wasteful number, since it uses less digits than its factorization.

25664426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12832215.

The product of its digits is 69120, while the sum is 35.

The square root of 25664426 is about 5066.0069087991. The cubic root of 25664426 is about 294.9695496675.

The spelling of 25664426 in words is "twenty-five million, six hundred sixty-four thousand, four hundred twenty-six".