166437863 has 2 divisors, whose sum is σ = 166437864. Its totient is φ = 166437862.

The previous prime is 166437847. The next prime is 166437881. The reversal of 166437863 is 368734661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166437863 - 2⁴ = 166437847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166487863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83218931 + 83218932.

It is an arithmetic number, because the mean of its divisors is an integer number (83218932).

Almost surely, 2^166437863 is an apocalyptic number.

166437863 is a deficient number, since it is larger than the sum of its proper divisors (1).

166437863 is an equidigital number, since it uses as much as digits as its factorization.

166437863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 166437863 is about 12901.0799160380. The cubic root of 166437863 is about 550.0692618009.

The spelling of 166437863 in words is "one hundred sixty-six million, four hundred thirty-seven thousand, eight hundred sixty-three".