66745667 has 2 divisors, whose sum is σ = 66745668. Its totient is φ = 66745666.

The previous prime is 66745633. The next prime is 66745681. The reversal of 66745667 is 76654766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66745667 - 2⁸ = 66745411 is a prime.

It is not a weakly prime, because it can be changed into another prime (66745607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33372833 + 33372834.

It is an arithmetic number, because the mean of its divisors is an integer number (33372834).

Almost surely, 2^66745667 is an apocalyptic number.

66745667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66745667 is an equidigital number, since it uses as much as digits as its factorization.

66745667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 47.

The square root of 66745667 is about 8169.8021395870. The cubic root of 66745667 is about 405.6402351426.

Subtracting 66745667 from its reverse (76654766), we obtain a palindrome (9909099).

The spelling of 66745667 in words is "sixty-six million, seven hundred forty-five thousand, six hundred sixty-seven".