66300691 has 4 divisors (see below), whose sum is σ = 67711392. Its totient is φ = 64889992.

The previous prime is 66300683. The next prime is 66300701. The reversal of 66300691 is 19600366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19600366 = 2 ⋅9800183.

It is a cyclic number.

It is not a de Polignac number, because 66300691 - 2³ = 66300683 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66300991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705280 + ... + 705373.

It is an arithmetic number, because the mean of its divisors is an integer number (16927848).

Almost surely, 2^66300691 is an apocalyptic number.

66300691 is a deficient number, since it is larger than the sum of its proper divisors (1410701).

66300691 is a wasteful number, since it uses less digits than its factorization.

66300691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410700.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 66300691 is about 8142.5236260020. The cubic root of 66300691 is about 404.7367918403.

The spelling of 66300691 in words is "sixty-six million, three hundred thousand, six hundred ninety-one".