66646934 has 4 divisors (see below), whose sum is σ = 99970404. Its totient is φ = 33323466.

The previous prime is 66646913. The next prime is 66646949. The reversal of 66646934 is 43964666.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16661732 + ... + 16661735.

It is an arithmetic number, because the mean of its divisors is an integer number (24992601).

Almost surely, 2^66646934 is an apocalyptic number.

66646934 is a deficient number, since it is larger than the sum of its proper divisors (33323470).

66646934 is a wasteful number, since it uses less digits than its factorization.

66646934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33323469.

The product of its digits is 559872, while the sum is 44.

The square root of 66646934 is about 8163.7573457324. The cubic root of 66646934 is about 405.4401230689.

The spelling of 66646934 in words is "sixty-six million, six hundred forty-six thousand, nine hundred thirty-four".