66199397 has 4 divisors (see below), whose sum is σ = 72217536. Its totient is φ = 60181260.

The previous prime is 66199361. The next prime is 66199421. The reversal of 66199397 is 79399166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66199397 - 2⁶ = 66199333 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 (66199307) 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, 3009053 + ... + 3009074.

It is an arithmetic number, because the mean of its divisors is an integer number (18054384).

Almost surely, 2^66199397 is an apocalyptic number.

It is an amenable number.

66199397 is a deficient number, since it is larger than the sum of its proper divisors (6018139).

66199397 is a wasteful number, since it uses less digits than its factorization.

66199397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018138.

The product of its digits is 551124, while the sum is 50.

The square root of 66199397 is about 8136.3011866572. The cubic root of 66199397 is about 404.5305682234.

The spelling of 66199397 in words is "sixty-six million, one hundred ninety-nine thousand, three hundred ninety-seven".