66977279 has 2 divisors, whose sum is σ = 66977280. Its totient is φ = 66977278.

The previous prime is 66977257. The next prime is 66977291. The reversal of 66977279 is 97277966.

66977279 is nontrivially palindromic in base 4.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66977279 - 2⁸ = 66977023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66977279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66977249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33488639 + 33488640.

It is an arithmetic number, because the mean of its divisors is an integer number (33488640).

Almost surely, 2^66977279 is an apocalyptic number.

66977279 is a deficient number, since it is larger than the sum of its proper divisors (1).

66977279 is an equidigital number, since it uses as much as digits as its factorization.

66977279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000376, while the sum is 53.

The square root of 66977279 is about 8183.9647482134. The cubic root of 66977279 is about 406.1088931948.

The spelling of 66977279 in words is "sixty-six million, nine hundred seventy-seven thousand, two hundred seventy-nine".