73666513 has 2 divisors, whose sum is σ = 73666514. Its totient is φ = 73666512.

The previous prime is 73666501. The next prime is 73666517. The reversal of 73666513 is 31566637.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62457409 + 11209104 = 7903^2 + 3348^2 .

It is a cyclic number.

It is not a de Polignac number, because 73666513 - 2²⁵ = 40112081 is a prime.

It is not a weakly prime, because it can be changed into another prime (73666517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36833256 + 36833257.

It is an arithmetic number, because the mean of its divisors is an integer number (36833257).

Almost surely, 2^73666513 is an apocalyptic number.

It is an amenable number.

73666513 is a deficient number, since it is larger than the sum of its proper divisors (1).

73666513 is an equidigital number, since it uses as much as digits as its factorization.

73666513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 37.

The square root of 73666513 is about 8582.9198411729. The cubic root of 73666513 is about 419.2020241566.

The spelling of 73666513 in words is "seventy-three million, six hundred sixty-six thousand, five hundred thirteen".