166530631 has 2 divisors, whose sum is σ = 166530632. Its totient is φ = 166530630.

The previous prime is 166530547. The next prime is 166530641. The reversal of 166530631 is 136035661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166530631 - 2¹³ = 166522439 is a prime.

It is a super-2 number, since 2×166530631² = 55464902122516322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166530593 and 166530602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166530641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265315 + 83265316.

It is an arithmetic number, because the mean of its divisors is an integer number (83265316).

Almost surely, 2^166530631 is an apocalyptic number.

166530631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166530631 is an equidigital number, since it uses as much as digits as its factorization.

166530631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 166530631 is about 12904.6747731200. The cubic root of 166530631 is about 550.1714407694.

The spelling of 166530631 in words is "one hundred sixty-six million, five hundred thirty thousand, six hundred thirty-one".