66206999 has 8 divisors (see below), whose sum is σ = 67026960. Its totient is φ = 65390976.

The previous prime is 66206989. The next prime is 66207019. The reversal of 66206999 is 99960266.

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

It is a cyclic number.

It is not a de Polignac number, because 66206999 - 2¹⁶ = 66141463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206929) 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, 45617 + ... + 47045.

It is an arithmetic number, because the mean of its divisors is an integer number (8378370).

Almost surely, 2^66206999 is an apocalyptic number.

66206999 is a deficient number, since it is larger than the sum of its proper divisors (819961).

66206999 is a wasteful number, since it uses less digits than its factorization.

66206999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 66206999 is about 8136.7683388431. The cubic root of 66206999 is about 404.5460523708.

The spelling of 66206999 in words is "sixty-six million, two hundred six thousand, nine hundred ninety-nine".