66870516 has 24 divisors (see below), whose sum is σ = 156532320. Its totient is φ = 22218592.

The previous prime is 66870509. The next prime is 66870521. The reversal of 66870516 is 61507866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4986 + ... + 12593.

It is an arithmetic number, because the mean of its divisors is an integer number (6522180).

Almost surely, 2^66870516 is an apocalyptic number.

It is an amenable number.

66870516 is an abundant number, since it is smaller than the sum of its proper divisors (89661804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66870516 is a wasteful number, since it uses less digits than its factorization.

66870516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17903 (or 17901 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 66870516 is about 8177.4394525426. The cubic root of 66870516 is about 405.8929967877.

The spelling of 66870516 in words is "sixty-six million, eight hundred seventy thousand, five hundred sixteen".