166986641 has 2 divisors, whose sum is σ = 166986642. Its totient is φ = 166986640.

The previous prime is 166986619. The next prime is 166986653. The reversal of 166986641 is 146689661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97614400 + 69372241 = 9880^2 + 8329^2 .

It is a cyclic number.

It is not a de Polignac number, because 166986641 - 2¹⁰ = 166985617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166986691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83493320 + 83493321.

It is an arithmetic number, because the mean of its divisors is an integer number (83493321).

Almost surely, 2^166986641 is an apocalyptic number.

It is an amenable number.

166986641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166986641 is an equidigital number, since it uses as much as digits as its factorization.

166986641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 166986641 is about 12922.3310977548. The cubic root of 166986641 is about 550.6731603372.

The spelling of 166986641 in words is "one hundred sixty-six million, nine hundred eighty-six thousand, six hundred forty-one".