66206137 has 2 divisors, whose sum is σ = 66206138. Its totient is φ = 66206136.

The previous prime is 66206131. The next prime is 66206149. The reversal of 66206137 is 73160266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33304441 + 32901696 = 5771^2 + 5736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66206137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66206099 and 66206108.

It is not a weakly prime, because it can be changed into another prime (66206131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33103068 + 33103069.

It is an arithmetic number, because the mean of its divisors is an integer number (33103069).

Almost surely, 2^66206137 is an apocalyptic number.

It is an amenable number.

66206137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66206137 is an equidigital number, since it uses as much as digits as its factorization.

66206137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66206137 is about 8136.7153692384. The cubic root of 66206137 is about 404.5442966642.

The spelling of 66206137 in words is "sixty-six million, two hundred six thousand, one hundred thirty-seven".