25643466 has 20 divisors (see below), whose sum is σ = 57460722. Its totient is φ = 8547768.

The previous prime is 25643441. The next prime is 25643489. The reversal of 25643466 is 66434652.

25643466 is a `hidden beast` number, since 2 + 5 + 643 + 4 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 8874441 = 4095^2 + 2979^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25643466.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 78985 + ... + 79308.

Almost surely, 2^25643466 is an apocalyptic number.

25643466 is an abundant number, since it is smaller than the sum of its proper divisors (31817256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25643466 is a wasteful number, since it uses less digits than its factorization.

25643466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158307 (or 158298 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 25643466 is about 5063.9377958265. The cubic root of 25643466 is about 294.8892277774.

The spelling of 25643466 in words is "twenty-five million, six hundred forty-three thousand, four hundred sixty-six".