66384072186434 has 4 divisors (see below), whose sum is σ = 99576108279654. Its totient is φ = 33192036093216.

The previous prime is 66384072186409. The next prime is 66384072186457. The reversal of 66384072186434 is 43468127048366.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 37277777435809 + 29106294750625 = 6105553^2 + 5395025^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16596018046607 + ... + 16596018046610.

Almost surely, 2^{66384072186434} is an apocalyptic number.

66384072186434 is a deficient number, since it is larger than the sum of its proper divisors (33192036093220).

66384072186434 is a wasteful number, since it uses less digits than its factorization.

66384072186434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33192036093219.

The product of its (nonzero) digits is 111476736, while the sum is 62.

The spelling of 66384072186434 in words is "sixty-six trillion, three hundred eighty-four billion, seventy-two million, one hundred eighty-six thousand, four hundred thirty-four".