66880939 has 2 divisors, whose sum is σ = 66880940. Its totient is φ = 66880938.

The previous prime is 66880927. The next prime is 66880967. The reversal of 66880939 is 93908866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66880939 - 2⁷ = 66880811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66880892 and 66880901.

It is not a weakly prime, because it can be changed into another prime (66880999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33440469 + 33440470.

It is an arithmetic number, because the mean of its divisors is an integer number (33440470).

Almost surely, 2^66880939 is an apocalyptic number.

66880939 is a deficient number, since it is larger than the sum of its proper divisors (1).

66880939 is an equidigital number, since it uses as much as digits as its factorization.

66880939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 66880939 is about 8178.0767298919. The cubic root of 66880939 is about 405.9140843221.

The spelling of 66880939 in words is "sixty-six million, eight hundred eighty thousand, nine hundred thirty-nine".