66782963776 has 21 divisors (see below), whose sum is σ = 132526546351. Its totient is φ = 33390448192.

The previous prime is 66782963773. The next prime is 66782963791. The reversal of 66782963776 is 67736928766.

The square root of 66782963776 is 258424.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66782963773) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2051241 + ... + 2083543.

Almost surely, 2^66782963776 is an apocalyptic number.

66782963776 is the 258424-th square number.

It is an amenable number.

66782963776 is a deficient number, since it is larger than the sum of its proper divisors (65743582575).

66782963776 is an frugal number, since it uses more digits than its factorization.

66782963776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64618 (or 32305 counting only the distinct ones).

The product of its digits is 192036096, while the sum is 67.

The spelling of 66782963776 in words is "sixty-six billion, seven hundred eighty-two million, nine hundred sixty-three thousand, seven hundred seventy-six".