66521982 has 32 divisors (see below), whose sum is σ = 135302400. Its totient is φ = 21800768.

The previous prime is 66521977. The next prime is 66522011. The reversal of 66521982 is 28912566.

It is a self number, because there is not a number n which added to its sum of digits gives 66521982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185119 + ... + 185477.

It is an arithmetic number, because the mean of its divisors is an integer number (4228200).

Almost surely, 2^66521982 is an apocalyptic number.

66521982 is an abundant number, since it is smaller than the sum of its proper divisors (68780418).

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

66521982 is a wasteful number, since it uses less digits than its factorization.

66521982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800.

The product of its digits is 51840, while the sum is 39.

The square root of 66521982 is about 8156.1009066833. The cubic root of 66521982 is about 405.1865867880.

The spelling of 66521982 in words is "sixty-six million, five hundred twenty-one thousand, nine hundred eighty-two".