12021660025 has 6 divisors (see below), whose sum is σ = 14906858462. Its totient is φ = 9617328000.

The previous prime is 12021660011. The next prime is 12021660043. The reversal of 12021660025 is 52006612021.

It can be written as a sum of positive squares in 3 ways, for example, as 2768759161 + 9252900864 = 52619^2 + 96192^2 .

It is not a de Polignac number, because 12021660025 - 2²⁵ = 11988105593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 480866401 = 12021660025 / (1 + 2 + 0 + 2 + 1 + 6 + 6 + 0 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 240433176 + ... + 240433225.

Almost surely, 2^12021660025 is an apocalyptic number.

It is an amenable number.

12021660025 is a deficient number, since it is larger than the sum of its proper divisors (2885198437).

12021660025 is an equidigital number, since it uses as much as digits as its factorization.

12021660025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480866411 (or 480866406 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 12021660025 in words is "twelve billion, twenty-one million, six hundred sixty thousand, twenty-five".