66391034 has 16 divisors (see below), whose sum is σ = 103334400. Its totient is φ = 31953264.

The previous prime is 66390991. The next prime is 66391079. The reversal of 66391034 is 43019366.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 19727 + ... + 22845.

It is an arithmetic number, because the mean of its divisors is an integer number (6458400).

Almost surely, 2^66391034 is an apocalyptic number.

66391034 is a deficient number, since it is larger than the sum of its proper divisors (36943366).

66391034 is a wasteful number, since it uses less digits than its factorization.

66391034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 66391034 is about 8148.0693418748. The cubic root of 66391034 is about 404.9205432703.

The spelling of 66391034 in words is "sixty-six million, three hundred ninety-one thousand, thirty-four".