66571842 has 16 divisors (see below), whose sum is σ = 134161632. Its totient is φ = 22020960.

The previous prime is 66571837. The next prime is 66571873. The reversal of 66571842 is 24817566.

It is a self number, because there is not a number n which added to its sum of digits gives 66571842.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41563 + ... + 43134.

It is an arithmetic number, because the mean of its divisors is an integer number (8385102).

Almost surely, 2^66571842 is an apocalyptic number.

66571842 is an abundant number, since it is smaller than the sum of its proper divisors (67589790).

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

66571842 is a wasteful number, since it uses less digits than its factorization.

66571842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84833.

The product of its digits is 80640, while the sum is 39.

The square root of 66571842 is about 8159.1569417434. The cubic root of 66571842 is about 405.2877942248.

The spelling of 66571842 in words is "sixty-six million, five hundred seventy-one thousand, eight hundred forty-two".