166020731 has 2 divisors, whose sum is σ = 166020732. Its totient is φ = 166020730.

The previous prime is 166020713. The next prime is 166020773. The reversal of 166020731 is 137020661.

Together with previous prime (166020713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166020731 - 2¹⁸ = 165758587 is a prime.

It is a super-2 number, since 2×166020731² = 55125766243548722, which contains 22 as substring.

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 166020731.

It is not a weakly prime, because it can be changed into another prime (166025731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83010365 + 83010366.

It is an arithmetic number, because the mean of its divisors is an integer number (83010366).

Almost surely, 2^166020731 is an apocalyptic number.

166020731 is a deficient number, since it is larger than the sum of its proper divisors (1).

166020731 is an equidigital number, since it uses as much as digits as its factorization.

166020731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 166020731 is about 12884.9032204359. The cubic root of 166020731 is about 549.6093435251.

The spelling of 166020731 in words is "one hundred sixty-six million, twenty thousand, seven hundred thirty-one".