66870853 has 16 divisors (see below), whose sum is σ = 78084864. Its totient is φ = 56085120.

The previous prime is 66870851. The next prime is 66870863. The reversal of 66870853 is 35807866.

It is not a de Polignac number, because 66870853 - 2¹ = 66870851 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 (66870851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77601 + ... + 78457.

It is an arithmetic number, because the mean of its divisors is an integer number (4880304).

Almost surely, 2^66870853 is an apocalyptic number.

It is an amenable number.

66870853 is a deficient number, since it is larger than the sum of its proper divisors (11214011).

66870853 is a wasteful number, since it uses less digits than its factorization.

66870853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 66870853 is about 8177.4600579887. The cubic root of 66870853 is about 405.8936786314.

The spelling of 66870853 in words is "sixty-six million, eight hundred seventy thousand, eight hundred fifty-three".