66166643 has 2 divisors, whose sum is σ = 66166644. Its totient is φ = 66166642.

The previous prime is 66166627. The next prime is 66166649. The reversal of 66166643 is 34666166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66166643 - 2⁴ = 66166627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66166597 and 66166606.

It is not a weakly prime, because it can be changed into another prime (66166649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083321 + 33083322.

It is an arithmetic number, because the mean of its divisors is an integer number (33083322).

Almost surely, 2^66166643 is an apocalyptic number.

66166643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166643 is an equidigital number, since it uses as much as digits as its factorization.

66166643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 38.

The square root of 66166643 is about 8134.2881065278. The cubic root of 66166643 is about 404.4638396191.

The spelling of 66166643 in words is "sixty-six million, one hundred sixty-six thousand, six hundred forty-three".