66969618 has 8 divisors (see below), whose sum is σ = 133939248. Its totient is φ = 22323204.

The previous prime is 66969611. The next prime is 66969653. The reversal of 66969618 is 81696966.

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

66969618 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66969611) 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, 5580796 + ... + 5580807.

It is an arithmetic number, because the mean of its divisors is an integer number (16742406).

Almost surely, 2^66969618 is an apocalyptic number.

66969618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66969618 is a wasteful number, since it uses less digits than its factorization.

66969618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11161608.

The product of its digits is 839808, while the sum is 51.

The square root of 66969618 is about 8183.4966854029. The cubic root of 66969618 is about 406.0934087455.

The spelling of 66969618 in words is "sixty-six million, nine hundred sixty-nine thousand, six hundred eighteen".