66520192 has 32 divisors (see below), whose sum is σ = 132911100. Its totient is φ = 33162240.

The previous prime is 66520177. The next prime is 66520211. The reversal of 66520192 is 29102566.

It can be written as a sum of positive squares in 2 ways, for example, as 63616576 + 2903616 = 7976^2 + 1704^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64642 + ... + 65662.

Almost surely, 2^66520192 is an apocalyptic number.

It is an amenable number.

66520192 is a deficient number, since it is larger than the sum of its proper divisors (66390908).

66520192 is a wasteful number, since it uses less digits than its factorization.

66520192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544 (or 1532 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66520192 is about 8155.9911721384. The cubic root of 66520192 is about 405.1829524481.

The spelling of 66520192 in words is "sixty-six million, five hundred twenty thousand, one hundred ninety-two".