66995830 has 32 divisors (see below), whose sum is σ = 131984640. Its totient is φ = 24282720.

The previous prime is 66995809. The next prime is 66995833. The reversal of 66995830 is 3859966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66995833) 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 15 ways as a sum of consecutive naturals, for example, 40887 + ... + 42493.

It is an arithmetic number, because the mean of its divisors is an integer number (4124520).

Almost surely, 2^66995830 is an apocalyptic number.

66995830 is a deficient number, since it is larger than the sum of its proper divisors (64988810).

66995830 is a wasteful number, since it uses less digits than its factorization.

66995830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 66995830 is about 8185.0980446174. The cubic root of 66995830 is about 406.1463836729.

The spelling of 66995830 in words is "sixty-six million, nine hundred ninety-five thousand, eight hundred thirty".