2166404357 has 8 divisors (see below), whose sum is σ = 2334530520. Its totient is φ = 1998489600.

The previous prime is 2166404351. The next prime is 2166404363. The reversal of 2166404357 is 7534046612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2166404351) and next prime (2166404363).

It can be written as a sum of positive squares in 4 ways, for example, as 1051445476 + 1114958881 = 32426^2 + 33391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166404357 - 2⁸ = 2166404101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166404357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166404351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31232 + ... + 72857.

It is an arithmetic number, because the mean of its divisors is an integer number (291816315).

Almost surely, 2^2166404357 is an apocalyptic number.

It is an amenable number.

2166404357 is a deficient number, since it is larger than the sum of its proper divisors (168126163).

2166404357 is a wasteful number, since it uses less digits than its factorization.

2166404357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105703.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 2166404357 is about 46544.6490694688. The cubic root of 2166404357 is about 1293.9371246305.

The spelling of 2166404357 in words is "two billion, one hundred sixty-six million, four hundred four thousand, three hundred fifty-seven".