66740747 has 2 divisors, whose sum is σ = 66740748. Its totient is φ = 66740746.

The previous prime is 66740719. The next prime is 66740767. The reversal of 66740747 is 74704766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66740747 - 2⁶ = 66740683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66740717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33370373 + 33370374.

It is an arithmetic number, because the mean of its divisors is an integer number (33370374).

Almost surely, 2^66740747 is an apocalyptic number.

66740747 is a deficient number, since it is larger than the sum of its proper divisors (1).

66740747 is an equidigital number, since it uses as much as digits as its factorization.

66740747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 66740747 is about 8169.5010251545. The cubic root of 66740747 is about 405.6302679588.

It can be divided in two parts, 667 and 40747, that added together give a palindrome (41414).

The spelling of 66740747 in words is "sixty-six million, seven hundred forty thousand, seven hundred forty-seven".