66016799 has 4 divisors (see below), whose sum is σ = 66491880. Its totient is φ = 65541720.

The previous prime is 66016787. The next prime is 66016813. The reversal of 66016799 is 99761066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66016799 - 2⁸ = 66016543 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 (66016199) 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, 237332 + ... + 237609.

It is an arithmetic number, because the mean of its divisors is an integer number (16622970).

Almost surely, 2^66016799 is an apocalyptic number.

66016799 is a deficient number, since it is larger than the sum of its proper divisors (475081).

66016799 is a wasteful number, since it uses less digits than its factorization.

66016799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475080.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 66016799 is about 8125.0722458326. The cubic root of 66016799 is about 404.1582864218.

The spelling of 66016799 in words is "sixty-six million, sixteen thousand, seven hundred ninety-nine".