66871656 has 96 divisors (see below), whose sum is σ = 192628800. Its totient is φ = 21720960.

The previous prime is 66871639. The next prime is 66871667. The reversal of 66871656 is 65617866.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79285 + ... + 80123.

It is an arithmetic number, because the mean of its divisors is an integer number (2006550).

Almost surely, 2^66871656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66871656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96314400).

66871656 is an abundant number, since it is smaller than the sum of its proper divisors (125757144).

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

66871656 is a wasteful number, since it uses less digits than its factorization.

66871656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 885 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66871656 is about 8177.5091562162. The cubic root of 66871656 is about 405.8953033119.

The spelling of 66871656 in words is "sixty-six million, eight hundred seventy-one thousand, six hundred fifty-six".