66273391 has 2 divisors, whose sum is σ = 66273392. Its totient is φ = 66273390.

The previous prime is 66273353. The next prime is 66273397. The reversal of 66273391 is 19337266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66273391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66273391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66273397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33136695 + 33136696.

It is an arithmetic number, because the mean of its divisors is an integer number (33136696).

Almost surely, 2^66273391 is an apocalyptic number.

66273391 is a deficient number, since it is larger than the sum of its proper divisors (1).

66273391 is an equidigital number, since it uses as much as digits as its factorization.

66273391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 66273391 is about 8140.8470689480. The cubic root of 66273391 is about 404.6812326842.

The spelling of 66273391 in words is "sixty-six million, two hundred seventy-three thousand, three hundred ninety-one".