66366137 has 2 divisors, whose sum is σ = 66366138. Its totient is φ = 66366136.

The previous prime is 66366127. The next prime is 66366149. The reversal of 66366137 is 73166366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64818601 + 1547536 = 8051^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 66366137 - 2⁶ = 66366073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66366137.

It is not a weakly prime, because it can be changed into another prime (66366127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33183068 + 33183069.

It is an arithmetic number, because the mean of its divisors is an integer number (33183069).

Almost surely, 2^66366137 is an apocalyptic number.

It is an amenable number.

66366137 is a deficient number, since it is larger than the sum of its proper divisors (1).

66366137 is an equidigital number, since it uses as much as digits as its factorization.

66366137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 38.

The square root of 66366137 is about 8146.5414133852. The cubic root of 66366137 is about 404.8699211376.

The spelling of 66366137 in words is "sixty-six million, three hundred sixty-six thousand, one hundred thirty-seven".