66722743 has 2 divisors, whose sum is σ = 66722744. Its totient is φ = 66722742.

The previous prime is 66722731. The next prime is 66722749. The reversal of 66722743 is 34722766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66722743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66722749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33361371 + 33361372.

It is an arithmetic number, because the mean of its divisors is an integer number (33361372).

Almost surely, 2^66722743 is an apocalyptic number.

66722743 is a deficient number, since it is larger than the sum of its proper divisors (1).

66722743 is an equidigital number, since it uses as much as digits as its factorization.

66722743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 37.

The square root of 66722743 is about 8168.3990475490. The cubic root of 66722743 is about 405.5937903722.

The spelling of 66722743 in words is "sixty-six million, seven hundred twenty-two thousand, seven hundred forty-three".