66773343778 has 16 divisors (see below), whose sum is σ = 100274212224. Its totient is φ = 33348631680.

The previous prime is 66773343731. The next prime is 66773343799. The reversal of 66773343778 is 87734337766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7638226 + ... + 7646962.

It is an arithmetic number, because the mean of its divisors is an integer number (6267138264).

Almost surely, 2^66773343778 is an apocalyptic number.

66773343778 is a deficient number, since it is larger than the sum of its proper divisors (33500868446).

66773343778 is a wasteful number, since it uses less digits than its factorization.

66773343778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12657.

The product of its digits is 74680704, while the sum is 61.

The spelling of 66773343778 in words is "sixty-six billion, seven hundred seventy-three million, three hundred forty-three thousand, seven hundred seventy-eight".