166317799 has 2 divisors, whose sum is σ = 166317800. Its totient is φ = 166317798.

The previous prime is 166317797. The next prime is 166317829. The reversal of 166317799 is 997713661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166317799 - 2¹ = 166317797 is a prime.

It is a super-2 number, since 2×166317799² = 55323220528408802, which contains 22 as substring.

Together with 166317797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166317797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83158899 + 83158900.

It is an arithmetic number, because the mean of its divisors is an integer number (83158900).

Almost surely, 2^166317799 is an apocalyptic number.

166317799 is a deficient number, since it is larger than the sum of its proper divisors (1).

166317799 is an equidigital number, since it uses as much as digits as its factorization.

166317799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 166317799 is about 12896.4258226844. The cubic root of 166317799 is about 549.9369613701.

The spelling of 166317799 in words is "one hundred sixty-six million, three hundred seventeen thousand, seven hundred ninety-nine".