66684067798 has 16 divisors (see below), whose sum is σ = 103995111024. Its totient is φ = 32043306240.

The previous prime is 66684067789. The next prime is 66684067799. The reversal of 66684067798 is 89776048666.

It is a Harshad number since it is a multiple of its sum of digits (67).

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 7 ways as a sum of consecutive naturals, for example, 6063315 + ... + 6074302.

It is an arithmetic number, because the mean of its divisors is an integer number (6499694439).

Almost surely, 2^66684067798 is an apocalyptic number.

66684067798 is a deficient number, since it is larger than the sum of its proper divisors (37311043226).

66684067798 is a wasteful number, since it uses less digits than its factorization.

66684067798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12137727.

The product of its (nonzero) digits is 146313216, while the sum is 67.

The spelling of 66684067798 in words is "sixty-six billion, six hundred eighty-four million, sixty-seven thousand, seven hundred ninety-eight".