1666911825 has 48 divisors (see below), whose sum is σ = 3099176640. Its totient is φ = 878279040.

The previous prime is 1666911797. The next prime is 1666911847. The reversal of 1666911825 is 5281196661.

It is not a de Polignac number, because 1666911825 - 2¹⁵ = 1666879057 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41149 + ... + 70901.

It is an arithmetic number, because the mean of its divisors is an integer number (64566180).

Almost surely, 2^1666911825 is an apocalyptic number.

1666911825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666911825 is a deficient number, since it is larger than the sum of its proper divisors (1432264815).

1666911825 is a wasteful number, since it uses less digits than its factorization.

1666911825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29855 (or 29844 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1666911825 is about 40827.8315000932. The cubic root of 1666911825 is about 1185.6892321155.

The spelling of 1666911825 in words is "one billion, six hundred sixty-six million, nine hundred eleven thousand, eight hundred twenty-five".