66140799 has 8 divisors (see below), whose sum is σ = 88373760. Its totient is φ = 44000856.

The previous prime is 66140783. The next prime is 66140819. The reversal of 66140799 is 99704166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66140799 - 2⁴ = 66140783 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66140799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66160799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21577 + ... + 24450.

It is an arithmetic number, because the mean of its divisors is an integer number (11046720).

Almost surely, 2^66140799 is an apocalyptic number.

66140799 is a deficient number, since it is larger than the sum of its proper divisors (22232961).

66140799 is a wasteful number, since it uses less digits than its factorization.

66140799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46509.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 66140799 is about 8132.6993673687. The cubic root of 66140799 is about 404.4111729771.

The spelling of 66140799 in words is "sixty-six million, one hundred forty thousand, seven hundred ninety-nine".