166427797 has 2 divisors, whose sum is σ = 166427798. Its totient is φ = 166427796.

The previous prime is 166427777. The next prime is 166427819. The reversal of 166427797 is 797724661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122788561 + 43639236 = 11081^2 + 6606^2 .

It is an emirp because it is prime and its reverse (797724661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166427797 - 2²⁷ = 32210069 is a prime.

It is a super-2 number, since 2×166427797² = 55396423228546418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166427797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166427717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83213898 + 83213899.

It is an arithmetic number, because the mean of its divisors is an integer number (83213899).

Almost surely, 2^166427797 is an apocalyptic number.

It is an amenable number.

166427797 is a deficient number, since it is larger than the sum of its proper divisors (1).

166427797 is an equidigital number, since it uses as much as digits as its factorization.

166427797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The square root of 166427797 is about 12900.6897877594. The cubic root of 166427797 is about 550.0581723594.

The spelling of 166427797 in words is "one hundred sixty-six million, four hundred twenty-seven thousand, seven hundred ninety-seven".