166838831 has 2 divisors, whose sum is σ = 166838832. Its totient is φ = 166838830.

The previous prime is 166838821. The next prime is 166838873. The reversal of 166838831 is 138838661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166838831 - 2¹⁸ = 166576687 is a prime.

It is a super-2 number, since 2×166838831² = 55670391058893122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166838801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83419415 + 83419416.

It is an arithmetic number, because the mean of its divisors is an integer number (83419416).

Almost surely, 2^166838831 is an apocalyptic number.

166838831 is a deficient number, since it is larger than the sum of its proper divisors (1).

166838831 is an equidigital number, since it uses as much as digits as its factorization.

166838831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 166838831 is about 12916.6106622442. The cubic root of 166838831 is about 550.5106343071.

The spelling of 166838831 in words is "one hundred sixty-six million, eight hundred thirty-eight thousand, eight hundred thirty-one".