66716806 has 36 divisors (see below), whose sum is σ = 115283412. Its totient is φ = 28938624.

The previous prime is 66716777. The next prime is 66716807. The reversal of 66716806 is 60861766.

It is a super-2 number, since 2×66716806² = 8902264405683272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66716807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 97341 + ... + 98023.

It is an arithmetic number, because the mean of its divisors is an integer number (3202317).

Almost surely, 2^66716806 is an apocalyptic number.

66716806 is a deficient number, since it is larger than the sum of its proper divisors (48566606).

66716806 is a wasteful number, since it uses less digits than its factorization.

66716806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66716806 is about 8168.0356267587. The cubic root of 66716806 is about 405.5817600827.

The spelling of 66716806 in words is "sixty-six million, seven hundred sixteen thousand, eight hundred six".