66440707 has 2 divisors, whose sum is σ = 66440708. Its totient is φ = 66440706.

The previous prime is 66440677. The next prime is 66440713. The reversal of 66440707 is 70704466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66440707 is a prime.

It is not a weakly prime, because it can be changed into another prime (66440797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33220353 + 33220354.

It is an arithmetic number, because the mean of its divisors is an integer number (33220354).

Almost surely, 2^66440707 is an apocalyptic number.

66440707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66440707 is an equidigital number, since it uses as much as digits as its factorization.

66440707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66440707 is about 8151.1169173310. The cubic root of 66440707 is about 405.0215037101.

The spelling of 66440707 in words is "sixty-six million, four hundred forty thousand, seven hundred seven".