66501866 has 8 divisors (see below), whose sum is σ = 101157984. Its totient is φ = 32782540.

The previous prime is 66501863. The next prime is 66501889. The reversal of 66501866 is 66810566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66501863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234020 + ... + 234303.

It is an arithmetic number, because the mean of its divisors is an integer number (12644748).

Almost surely, 2^66501866 is an apocalyptic number.

66501866 is a deficient number, since it is larger than the sum of its proper divisors (34656118).

66501866 is a wasteful number, since it uses less digits than its factorization.

66501866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468396.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66501866 is about 8154.8676261482. The cubic root of 66501866 is about 405.1457403648.

The spelling of 66501866 in words is "sixty-six million, five hundred one thousand, eight hundred sixty-six".