66140099 has 4 divisors (see below), whose sum is σ = 66203040. Its totient is φ = 66077160.

The previous prime is 66140077. The next prime is 66140101. The reversal of 66140099 is 99004166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99004166 = 2 ⋅49502083.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66140099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66140069) 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, 29867 + ... + 32004.

It is an arithmetic number, because the mean of its divisors is an integer number (16550760).

Almost surely, 2^66140099 is an apocalyptic number.

66140099 is a deficient number, since it is larger than the sum of its proper divisors (62941).

66140099 is a wasteful number, since it uses less digits than its factorization.

66140099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62940.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 66140099 is about 8132.6563311135. The cubic root of 66140099 is about 404.4097462791.

The spelling of 66140099 in words is "sixty-six million, one hundred forty thousand, ninety-nine".