66723061 has 2 divisors, whose sum is σ = 66723062. Its totient is φ = 66723060.

The previous prime is 66723049. The next prime is 66723071. The reversal of 66723061 is 16032766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43970161 + 22752900 = 6631^2 + 4770^2 .

It is a cyclic number.

It is not a de Polignac number, because 66723061 - 2²³ = 58334453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66723071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33361530 + 33361531.

It is an arithmetic number, because the mean of its divisors is an integer number (33361531).

Almost surely, 2^66723061 is an apocalyptic number.

It is an amenable number.

66723061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66723061 is an equidigital number, since it uses as much as digits as its factorization.

66723061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66723061 is about 8168.4185127845. The cubic root of 66723061 is about 405.5944347234.

The spelling of 66723061 in words is "sixty-six million, seven hundred twenty-three thousand, sixty-one".