166861963 has 2 divisors, whose sum is σ = 166861964. Its totient is φ = 166861962.

The previous prime is 166861943. The next prime is 166861979. The reversal of 166861963 is 369168661.

166861963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166861963 is a prime.

It is not a weakly prime, because it can be changed into another prime (166861943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83430981 + 83430982.

It is an arithmetic number, because the mean of its divisors is an integer number (83430982).

Almost surely, 2^166861963 is an apocalyptic number.

166861963 is a deficient number, since it is larger than the sum of its proper divisors (1).

166861963 is an equidigital number, since it uses as much as digits as its factorization.

166861963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 166861963 is about 12917.5060673491. The cubic root of 166861963 is about 550.5360756735.

The spelling of 166861963 in words is "one hundred sixty-six million, eight hundred sixty-one thousand, nine hundred sixty-three".