66907439 has 2 divisors, whose sum is σ = 66907440. Its totient is φ = 66907438.

The previous prime is 66907409. The next prime is 66907453. The reversal of 66907439 is 93470966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66907439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66907439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66907409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33453719 + 33453720.

It is an arithmetic number, because the mean of its divisors is an integer number (33453720).

Almost surely, 2^66907439 is an apocalyptic number.

66907439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66907439 is an equidigital number, since it uses as much as digits as its factorization.

66907439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 66907439 is about 8179.6967547703. The cubic root of 66907439 is about 405.9676885478.

The spelling of 66907439 in words is "sixty-six million, nine hundred seven thousand, four hundred thirty-nine".