66726961079 has 4 divisors (see below), whose sum is σ = 66762063960. Its totient is φ = 66691858200.

The previous prime is 66726961073. The next prime is 66726961109. The reversal of 66726961079 is 97016962766.

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 66726961079 - 2⁸ = 66726960823 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 (66726961073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17548589 + ... + 17552390.

It is an arithmetic number, because the mean of its divisors is an integer number (16690515990).

Almost surely, 2^66726961079 is an apocalyptic number.

66726961079 is a deficient number, since it is larger than the sum of its proper divisors (35102881).

66726961079 is a wasteful number, since it uses less digits than its factorization.

66726961079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35102880.

The product of its (nonzero) digits is 10287648, while the sum is 59.

The spelling of 66726961079 in words is "sixty-six billion, seven hundred twenty-six million, nine hundred sixty-one thousand, seventy-nine".