66504687 has 4 divisors (see below), whose sum is σ = 88672920. Its totient is φ = 44336456.

The previous prime is 66504677. The next prime is 66504733. The reversal of 66504687 is 78640566.

It is a happy number.

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 66504687 - 2¹⁶ = 66439151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66504637) 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, 11084112 + ... + 11084117.

It is an arithmetic number, because the mean of its divisors is an integer number (22168230).

Almost surely, 2^66504687 is an apocalyptic number.

66504687 is a deficient number, since it is larger than the sum of its proper divisors (22168233).

66504687 is a wasteful number, since it uses less digits than its factorization.

66504687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22168232.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 66504687 is about 8155.0405884949. The cubic root of 66504687 is about 405.1514690259.

The spelling of 66504687 in words is "sixty-six million, five hundred four thousand, six hundred eighty-seven".