66684067792 has 20 divisors (see below), whose sum is σ = 129290838820. Its totient is φ = 33318690048.

The previous prime is 66684067789. The next prime is 66684067799. The reversal of 66684067792 is 29776048666.

It can be written as a sum of positive squares in 2 ways, for example, as 40022403136 + 26661664656 = 200056^2 + 163284^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66684067792.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66684067799) 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, 1435413 + ... + 1481140.

It is an arithmetic number, because the mean of its divisors is an integer number (6464541941).

Almost surely, 2^66684067792 is an apocalyptic number.

It is an amenable number.

66684067792 is a deficient number, since it is larger than the sum of its proper divisors (62606771028).

66684067792 is a wasteful number, since it uses less digits than its factorization.

66684067792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917990 (or 2917984 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 61.

The spelling of 66684067792 in words is "sixty-six billion, six hundred eighty-four million, sixty-seven thousand, seven hundred ninety-two".