66742099 has 4 divisors (see below), whose sum is σ = 66773736. Its totient is φ = 66710464.

The previous prime is 66742087. The next prime is 66742103. The reversal of 66742099 is 99024766.

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 66742099 - 2⁷ = 66741971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66742199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12409 + ... + 16954.

It is an arithmetic number, because the mean of its divisors is an integer number (16693434).

Almost surely, 2^66742099 is an apocalyptic number.

66742099 is a deficient number, since it is larger than the sum of its proper divisors (31637).

66742099 is a wasteful number, since it uses less digits than its factorization.

66742099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31636.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 66742099 is about 8169.5837715272. The cubic root of 66742099 is about 405.6330069573.

The spelling of 66742099 in words is "sixty-six million, seven hundred forty-two thousand, ninety-nine".