66206248679 has 4 divisors (see below), whose sum is σ = 67291597080. Its totient is φ = 65120900280.

The previous prime is 66206248663. The next prime is 66206248681. The reversal of 66206248679 is 97684260266.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66206248679 - 2⁴ = 66206248663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206248079) 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, 542674109 + ... + 542674230.

It is an arithmetic number, because the mean of its divisors is an integer number (16822899270).

Almost surely, 2^66206248679 is an apocalyptic number.

66206248679 is a deficient number, since it is larger than the sum of its proper divisors (1085348401).

66206248679 is a wasteful number, since it uses less digits than its factorization.

66206248679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085348400.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 66206248679 in words is "sixty-six billion, two hundred six million, two hundred forty-eight thousand, six hundred seventy-nine".