66700667 has 16 divisors (see below), whose sum is σ = 78554880. Its totient is φ = 55994400.

The previous prime is 66700657. The next prime is 66700691. The reversal of 66700667 is 76600766.

It is not a de Polignac number, because 66700667 - 2¹⁰ = 66699643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66700667.

It is not an unprimeable number, because it can be changed into a prime (66700657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2792 + ... + 11882.

It is an arithmetic number, because the mean of its divisors is an integer number (4909680).

Almost surely, 2^66700667 is an apocalyptic number.

66700667 is a deficient number, since it is larger than the sum of its proper divisors (11854213).

66700667 is a wasteful number, since it uses less digits than its factorization.

66700667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9154.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 66700667 is about 8167.0476305701. The cubic root of 66700667 is about 405.5490536214.

Subtracting 66700667 from its reverse (76600766), we obtain a palindrome (9900099).

It can be divided in two parts, 66700 and 667, that multiplied together give a square (44488900 = 6670²).

The spelling of 66700667 in words is "sixty-six million, seven hundred thousand, six hundred sixty-seven".