66990307 has 2 divisors, whose sum is σ = 66990308. Its totient is φ = 66990306.

The previous prime is 66990299. The next prime is 66990331. The reversal of 66990307 is 70309966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66990307 - 2³ = 66990299 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66990307.

It is not a weakly prime, because it can be changed into another prime (66990337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33495153 + 33495154.

It is an arithmetic number, because the mean of its divisors is an integer number (33495154).

Almost surely, 2^66990307 is an apocalyptic number.

66990307 is a deficient number, since it is larger than the sum of its proper divisors (1).

66990307 is an equidigital number, since it uses as much as digits as its factorization.

66990307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 66990307 is about 8184.7606562440. The cubic root of 66990307 is about 406.1352227389.

The spelling of 66990307 in words is "sixty-six million, nine hundred ninety thousand, three hundred seven".