1666854025 has 24 divisors (see below), whose sum is σ = 2158254720. Its totient is φ = 1275408960.

The previous prime is 1666853921. The next prime is 1666854043. The reversal of 1666854025 is 5204586661.

It is not a de Polignac number, because 1666854025 - 2²⁵ = 1633299593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66832 + ... + 88318.

It is an arithmetic number, because the mean of its divisors is an integer number (89927280).

Almost surely, 2^1666854025 is an apocalyptic number.

It is an amenable number.

1666854025 is a deficient number, since it is larger than the sum of its proper divisors (491400695).

1666854025 is a wasteful number, since it uses less digits than its factorization.

1666854025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21633 (or 21628 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1666854025 is about 40827.1236434800. The cubic root of 1666854025 is about 1185.6755274054.

The spelling of 1666854025 in words is "one billion, six hundred sixty-six million, eight hundred fifty-four thousand, twenty-five".