25664633 has 4 divisors (see below), whose sum is σ = 25828260. Its totient is φ = 25501008.

The previous prime is 25664629. The next prime is 25664657. The reversal of 25664633 is 33646652.

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 9560464 + 16104169 = 3092^2 + 4013^2 .

It is a cyclic number.

It is not a de Polignac number, because 25664633 - 2² = 25664629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25664593 and 25664602.

It is not an unprimeable number, because it can be changed into a prime (25666633) 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, 81578 + ... + 81891.

It is an arithmetic number, because the mean of its divisors is an integer number (6457065).

Almost surely, 2^25664633 is an apocalyptic number.

It is an amenable number.

25664633 is a deficient number, since it is larger than the sum of its proper divisors (163627).

25664633 is a wasteful number, since it uses less digits than its factorization.

25664633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163626.

The product of its digits is 77760, while the sum is 35.

The square root of 25664633 is about 5066.0273390498. The cubic root of 25664633 is about 294.9703427047.

The spelling of 25664633 in words is "twenty-five million, six hundred sixty-four thousand, six hundred thirty-three".