66746887 has 4 divisors (see below), whose sum is σ = 67687056. Its totient is φ = 65806720.

The previous prime is 66746881. The next prime is 66746899. The reversal of 66746887 is 78864766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66746887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66746881) 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, 469978 + ... + 470119.

It is an arithmetic number, because the mean of its divisors is an integer number (16921764).

Almost surely, 2^66746887 is an apocalyptic number.

66746887 is a deficient number, since it is larger than the sum of its proper divisors (940169).

66746887 is an equidigital number, since it uses as much as digits as its factorization.

66746887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940168.

The product of its digits is 2709504, while the sum is 52.

The square root of 66746887 is about 8169.8768044567. The cubic root of 66746887 is about 405.6427066043.

The spelling of 66746887 in words is "sixty-six million, seven hundred forty-six thousand, eight hundred eighty-seven".