66726979 has 16 divisors (see below), whose sum is σ = 76769280. Its totient is φ = 57404160.

The previous prime is 66726977. The next prime is 66726983. The reversal of 66726979 is 97962766.

It is not a de Polignac number, because 66726979 - 2¹ = 66726977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66726977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23182 + ... + 25900.

It is an arithmetic number, because the mean of its divisors is an integer number (4798080).

Almost surely, 2^66726979 is an apocalyptic number.

66726979 is a deficient number, since it is larger than the sum of its proper divisors (10042301).

66726979 is a wasteful number, since it uses less digits than its factorization.

66726979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850.

The product of its digits is 1714608, while the sum is 52.

The square root of 66726979 is about 8168.6583353694. The cubic root of 66726979 is about 405.6023734473.

The spelling of 66726979 in words is "sixty-six million, seven hundred twenty-six thousand, nine hundred seventy-nine".