66850199 has 4 divisors (see below), whose sum is σ = 71992536. Its totient is φ = 61707864.

The previous prime is 66850187. The next prime is 66850207. The reversal of 66850199 is 99105866.

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 66850199 - 2²⁴ = 50072983 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 (66850139) 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, 2571149 + ... + 2571174.

It is an arithmetic number, because the mean of its divisors is an integer number (17998134).

Almost surely, 2^66850199 is an apocalyptic number.

66850199 is a deficient number, since it is larger than the sum of its proper divisors (5142337).

66850199 is a wasteful number, since it uses less digits than its factorization.

66850199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142336.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 66850199 is about 8176.1970988963. The cubic root of 66850199 is about 405.8518856782.

The spelling of 66850199 in words is "sixty-six million, eight hundred fifty thousand, one hundred ninety-nine".