66728400674 has 16 divisors (see below), whose sum is σ = 111269195520. Its totient is φ = 29804248080.

The previous prime is 66728400617. The next prime is 66728400703. The reversal of 66728400674 is 47600482766.

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, 41393984 + ... + 41395595.

It is an arithmetic number, because the mean of its divisors is an integer number (6954324720).

Almost surely, 2^66728400674 is an apocalyptic number.

66728400674 is a deficient number, since it is larger than the sum of its proper divisors (44540794846).

66728400674 is a wasteful number, since it uses less digits than its factorization.

66728400674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82789625.

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 66728400674 in words is "sixty-six billion, seven hundred twenty-eight million, four hundred thousand, six hundred seventy-four".