166309840843 has 2 divisors, whose sum is σ = 166309840844. Its totient is φ = 166309840842.

The previous prime is 166309840811. The next prime is 166309840859. The reversal of 166309840843 is 348048903661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166309840843 - 2⁵ = 166309840811 is a prime.

It is a super-2 number, since 2×166309840843² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166309840643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83154920421 + 83154920422.

It is an arithmetic number, because the mean of its divisors is an integer number (83154920422).

Almost surely, 2^166309840843 is an apocalyptic number.

166309840843 is a deficient number, since it is larger than the sum of its proper divisors (1).

166309840843 is an equidigital number, since it uses as much as digits as its factorization.

166309840843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 166309840843 in words is "one hundred sixty-six billion, three hundred nine million, eight hundred forty thousand, eight hundred forty-three".