66464687 has 4 divisors (see below), whose sum is σ = 69354480. Its totient is φ = 63574896.

The previous prime is 66464683. The next prime is 66464701. The reversal of 66464687 is 78646466.

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

It is a cyclic number.

It is not a de Polignac number, because 66464687 - 2² = 66464683 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 (66464681) 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, 1444862 + ... + 1444907.

It is an arithmetic number, because the mean of its divisors is an integer number (17338620).

Almost surely, 2^66464687 is an apocalyptic number.

66464687 is a deficient number, since it is larger than the sum of its proper divisors (2889793).

66464687 is a wasteful number, since it uses less digits than its factorization.

66464687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889792.

The product of its digits is 1161216, while the sum is 47.

The square root of 66464687 is about 8152.5877486845. The cubic root of 66464687 is about 405.0702250832.

The spelling of 66464687 in words is "sixty-six million, four hundred sixty-four thousand, six hundred eighty-seven".