66830837 has 2 divisors, whose sum is σ = 66830838. Its totient is φ = 66830836.

The previous prime is 66830833. The next prime is 66830839. The reversal of 66830837 is 73803866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44609041 + 22221796 = 6679^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 66830837 - 2² = 66830833 is a prime.

Together with 66830839, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66830794 and 66830803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66830833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33415418 + 33415419.

It is an arithmetic number, because the mean of its divisors is an integer number (33415419).

Almost surely, 2^66830837 is an apocalyptic number.

It is an amenable number.

66830837 is a deficient number, since it is larger than the sum of its proper divisors (1).

66830837 is an equidigital number, since it uses as much as digits as its factorization.

66830837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 66830837 is about 8175.0129663506. The cubic root of 66830837 is about 405.8126992429.

The spelling of 66830837 in words is "sixty-six million, eight hundred thirty thousand, eight hundred thirty-seven".