2166904757 has 2 divisors, whose sum is σ = 2166904758. Its totient is φ = 2166904756.

The previous prime is 2166904721. The next prime is 2166904759. The reversal of 2166904757 is 7574096612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2163552196 + 3352561 = 46514^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166904757 - 2⁶ = 2166904693 is a prime.

Together with 2166904759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166904759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083452378 + 1083452379.

It is an arithmetic number, because the mean of its divisors is an integer number (1083452379).

Almost surely, 2^2166904757 is an apocalyptic number.

It is an amenable number.

2166904757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166904757 is an equidigital number, since it uses as much as digits as its factorization.

2166904757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 2166904757 is about 46550.0242427434. The cubic root of 2166904757 is about 1294.0367422741.

The spelling of 2166904757 in words is "two billion, one hundred sixty-six million, nine hundred four thousand, seven hundred fifty-seven".