166772407 has 2 divisors, whose sum is σ = 166772408. Its totient is φ = 166772406.

The previous prime is 166772321. The next prime is 166772413. The reversal of 166772407 is 704277661.

It is a strong prime.

It is an emirp because it is prime and its reverse (704277661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166772407 - 2⁷ = 166772279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166772407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166772477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83386203 + 83386204.

It is an arithmetic number, because the mean of its divisors is an integer number (83386204).

Almost surely, 2^166772407 is an apocalyptic number.

166772407 is a deficient number, since it is larger than the sum of its proper divisors (1).

166772407 is an equidigital number, since it uses as much as digits as its factorization.

166772407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 166772407 is about 12914.0391435058. The cubic root of 166772407 is about 550.4375658412.

The spelling of 166772407 in words is "one hundred sixty-six million, seven hundred seventy-two thousand, four hundred seven".