66784258832 has 20 divisors (see below), whose sum is σ = 129836130060. Its totient is φ = 33278160768.

The previous prime is 66784258831. The next prime is 66784258837. The reversal of 66784258832 is 23885248766.

66784258832 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 49250261776 + 17533997056 = 221924^2 + 132416^2 .

It is not an unprimeable number, because it can be changed into a prime (66784258831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7118207 + ... + 7127582.

It is an arithmetic number, because the mean of its divisors is an integer number (6491806503).

Almost surely, 2^66784258832 is an apocalyptic number.

It is an amenable number.

66784258832 is a deficient number, since it is larger than the sum of its proper divisors (63051871228).

66784258832 is a wasteful number, since it uses less digits than its factorization.

66784258832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14246090 (or 14246084 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 59.

The spelling of 66784258832 in words is "sixty-six billion, seven hundred eighty-four million, two hundred fifty-eight thousand, eight hundred thirty-two".