166404457 has 8 divisors (see below), whose sum is σ = 169360200. Its totient is φ = 163473024.

The previous prime is 166404443. The next prime is 166404463. The reversal of 166404457 is 754404661.

166404457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 226576 + 166177881 = 476^2 + 12891^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166404457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166404437) 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, 8019 + ... + 19927.

It is an arithmetic number, because the mean of its divisors is an integer number (21170025).

Almost surely, 2^166404457 is an apocalyptic number.

It is an amenable number.

166404457 is a deficient number, since it is larger than the sum of its proper divisors (2955743).

166404457 is a wasteful number, since it uses less digits than its factorization.

166404457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12155.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 166404457 is about 12899.7851532496. The cubic root of 166404457 is about 550.0324575886.

The spelling of 166404457 in words is "one hundred sixty-six million, four hundred four thousand, four hundred fifty-seven".