2166904725 has 24 divisors (see below), whose sum is σ = 3586332960. Its totient is φ = 1154483520.

The previous prime is 2166904721. The next prime is 2166904757. The reversal of 2166904725 is 5274096612.

It is not a de Polignac number, because 2166904725 - 2² = 2166904721 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166904721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60286 + ... + 89264.

It is an arithmetic number, because the mean of its divisors is an integer number (149430540).

Almost surely, 2^2166904725 is an apocalyptic number.

2166904725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2166904725 is a deficient number, since it is larger than the sum of its proper divisors (1419428235).

2166904725 is a wasteful number, since it uses less digits than its factorization.

2166904725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29989 (or 29984 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 2166904725 is about 46550.0238990272. The cubic root of 2166904725 is about 1294.0367359041.

The spelling of 2166904725 in words is "two billion, one hundred sixty-six million, nine hundred four thousand, seven hundred twenty-five".