66299910 has 16 divisors (see below), whose sum is σ = 159119856. Its totient is φ = 17679968.

The previous prime is 66299903. The next prime is 66299921. The reversal of 66299910 is 1999266.

It is a happy number.

66299910 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1104969 + ... + 1105028.

It is an arithmetic number, because the mean of its divisors is an integer number (9944991).

Almost surely, 2^66299910 is an apocalyptic number.

66299910 is an abundant number, since it is smaller than the sum of its proper divisors (92819946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66299910 is a wasteful number, since it uses less digits than its factorization.

66299910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210007.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 66299910 is about 8142.4756677561. The cubic root of 66299910 is about 404.7352026126.

The spelling of 66299910 in words is "sixty-six million, two hundred ninety-nine thousand, nine hundred ten".