73666613 has 2 divisors, whose sum is σ = 73666614. Its totient is φ = 73666612.

The previous prime is 73666601. The next prime is 73666639. The reversal of 73666613 is 31666637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70593604 + 3073009 = 8402^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 73666613 - 2⁴ = 73666597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73666513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36833306 + 36833307.

It is an arithmetic number, because the mean of its divisors is an integer number (36833307).

Almost surely, 2^73666613 is an apocalyptic number.

It is an amenable number.

73666613 is a deficient number, since it is larger than the sum of its proper divisors (1).

73666613 is an equidigital number, since it uses as much as digits as its factorization.

73666613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

The square root of 73666613 is about 8582.9256666943. The cubic root of 73666613 is about 419.2022138411.

The spelling of 73666613 in words is "seventy-three million, six hundred sixty-six thousand, six hundred thirteen".