66420166 has 16 divisors (see below), whose sum is σ = 104008320. Its totient is φ = 31775040.

The previous prime is 66420163. The next prime is 66420187. The reversal of 66420166 is 66102466.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66420161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501 + ... + 11536.

It is an arithmetic number, because the mean of its divisors is an integer number (6500520).

Almost surely, 2^66420166 is an apocalyptic number.

66420166 is a deficient number, since it is larger than the sum of its proper divisors (37588154).

66420166 is a wasteful number, since it uses less digits than its factorization.

66420166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12159.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 66420166 is about 8149.8568085580. The cubic root of 66420166 is about 404.9797602038.

The spelling of 66420166 in words is "sixty-six million, four hundred twenty thousand, one hundred sixty-six".