25603666066 has 12 divisors (see below), whose sum is σ = 42214309326. Its totient is φ = 11638029920.

The previous prime is 25603666063. The next prime is 25603666069. The reversal of 25603666066 is 66066630652.

It is an interprime number because it is at equal distance from previous prime (25603666063) and next prime (25603666069).

It can be written as a sum of positive squares in only one way, i.e., 14310140625 + 11293525441 = 119625^2 + 106271^2 .

It is not an unprimeable number, because it can be changed into a prime (25603666063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52899895 + ... + 52900378.

Almost surely, 2^25603666066 is an apocalyptic number.

25603666066 is a deficient number, since it is larger than the sum of its proper divisors (16610643260).

25603666066 is a wasteful number, since it uses less digits than its factorization.

25603666066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105800297 (or 105800286 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 25603666066 in words is "twenty-five billion, six hundred three million, six hundred sixty-six thousand, sixty-six".