66010709 has 2 divisors, whose sum is σ = 66010710. Its totient is φ = 66010708.

The previous prime is 66010691. The next prime is 66010729. The reversal of 66010709 is 90701066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62362609 + 3648100 = 7897^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 66010709 - 2²⁴ = 49233493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66010729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33005354 + 33005355.

It is an arithmetic number, because the mean of its divisors is an integer number (33005355).

Almost surely, 2^66010709 is an apocalyptic number.

It is an amenable number.

66010709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66010709 is an equidigital number, since it uses as much as digits as its factorization.

66010709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 66010709 is about 8124.6974712909. The cubic root of 66010709 is about 404.1458582738.

The spelling of 66010709 in words is "sixty-six million, ten thousand, seven hundred nine".