166472639 has 2 divisors, whose sum is σ = 166472640. Its totient is φ = 166472638.

The previous prime is 166472569. The next prime is 166472659. The reversal of 166472639 is 936274661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166472639 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166472639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166472659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83236319 + 83236320.

It is an arithmetic number, because the mean of its divisors is an integer number (83236320).

Almost surely, 2^166472639 is an apocalyptic number.

166472639 is a deficient number, since it is larger than the sum of its proper divisors (1).

166472639 is an equidigital number, since it uses as much as digits as its factorization.

166472639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 44.

The square root of 166472639 is about 12902.4276397893. The cubic root of 166472639 is about 550.1075701444.

The spelling of 166472639 in words is "one hundred sixty-six million, four hundred seventy-two thousand, six hundred thirty-nine".