66962509 has 2 divisors, whose sum is σ = 66962510. Its totient is φ = 66962508.

The previous prime is 66962477. The next prime is 66962527. The reversal of 66962509 is 90526966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38713284 + 28249225 = 6222^2 + 5315^2 .

It is a cyclic number.

It is not a de Polignac number, because 66962509 - 2⁵ = 66962477 is a prime.

It is a super-2 number, since 2×66962509² = 8967955223150162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66962549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33481254 + 33481255.

It is an arithmetic number, because the mean of its divisors is an integer number (33481255).

Almost surely, 2^66962509 is an apocalyptic number.

It is an amenable number.

66962509 is a deficient number, since it is larger than the sum of its proper divisors (1).

66962509 is an equidigital number, since it uses as much as digits as its factorization.

66962509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 66962509 is about 8183.0623240936. The cubic root of 66962509 is about 406.0790389447.

The spelling of 66962509 in words is "sixty-six million, nine hundred sixty-two thousand, five hundred nine".