66316566 has 16 divisors (see below), whose sum is σ = 132753600. Its totient is φ = 22085448.

The previous prime is 66316561. The next prime is 66316573. The reversal of 66316566 is 66561366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66316561) 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, 3165 + ... + 11943.

It is an arithmetic number, because the mean of its divisors is an integer number (8297100).

Almost surely, 2^66316566 is an apocalyptic number.

66316566 is an abundant number, since it is smaller than the sum of its proper divisors (66437034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66316566 is a wasteful number, since it uses less digits than its factorization.

66316566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10043.

The product of its digits is 116640, while the sum is 39.

The square root of 66316566 is about 8143.4983882850. The cubic root of 66316566 is about 404.7690925787.

The spelling of 66316566 in words is "sixty-six million, three hundred sixteen thousand, five hundred sixty-six".