66242899 has 4 divisors (see below), whose sum is σ = 67365720. Its totient is φ = 65120080.

The previous prime is 66242893. The next prime is 66242927. The reversal of 66242899 is 99824266.

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 66242899 - 2²¹ = 64145747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66242893) 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, 561322 + ... + 561439.

It is an arithmetic number, because the mean of its divisors is an integer number (16841430).

Almost surely, 2^66242899 is an apocalyptic number.

66242899 is a deficient number, since it is larger than the sum of its proper divisors (1122821).

66242899 is a wasteful number, since it uses less digits than its factorization.

66242899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122820.

The product of its digits is 373248, while the sum is 46.

The square root of 66242899 is about 8138.9740753980. The cubic root of 66242899 is about 404.6191593398.

The spelling of 66242899 in words is "sixty-six million, two hundred forty-two thousand, eight hundred ninety-nine".