66516337 has 2 divisors, whose sum is σ = 66516338. Its totient is φ = 66516336.

The previous prime is 66516319. The next prime is 66516349. The reversal of 66516337 is 73361566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65999376 + 516961 = 8124^2 + 719^2 .

It is a cyclic number.

It is not a de Polignac number, because 66516337 - 2⁷ = 66516209 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66516296 and 66516305.

It is not a weakly prime, because it can be changed into another prime (66514337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33258168 + 33258169.

It is an arithmetic number, because the mean of its divisors is an integer number (33258169).

Almost surely, 2^66516337 is an apocalyptic number.

It is an amenable number.

66516337 is a deficient number, since it is larger than the sum of its proper divisors (1).

66516337 is an equidigital number, since it uses as much as digits as its factorization.

66516337 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 66516337 is about 8155.7548393757. The cubic root of 66516337 is about 405.1751251984.

The spelling of 66516337 in words is "sixty-six million, five hundred sixteen thousand, three hundred thirty-seven".