66730513 has 2 divisors, whose sum is σ = 66730514. Its totient is φ = 66730512.

The previous prime is 66730487. The next prime is 66730519. The reversal of 66730513 is 31503766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43996689 + 22733824 = 6633^2 + 4768^2 .

It is a cyclic number.

It is not a de Polignac number, because 66730513 - 2⁵ = 66730481 is a prime.

It is a super-2 number, since 2×66730513² = 8905922730486338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66730519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33365256 + 33365257.

It is an arithmetic number, because the mean of its divisors is an integer number (33365257).

Almost surely, 2^66730513 is an apocalyptic number.

It is an amenable number.

66730513 is a deficient number, since it is larger than the sum of its proper divisors (1).

66730513 is an equidigital number, since it uses as much as digits as its factorization.

66730513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 66730513 is about 8168.8746470980. The cubic root of 66730513 is about 405.6095338369.

The spelling of 66730513 in words is "sixty-six million, seven hundred thirty thousand, five hundred thirteen".