66197665332 has 36 divisors (see below), whose sum is σ = 167364236676. Its totient is φ = 22061767680.

The previous prime is 66197665207. The next prime is 66197665351. The reversal of 66197665332 is 23356679166.

66197665332 is a `hidden beast` number, since 66 + 197 + 6 + 65 + 332 = 666.

66197665332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 28478587536 + 37719077796 = 168756^2 + 194214^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26898 + ... + 364854.

Almost surely, 2^66197665332 is an apocalyptic number.

It is an amenable number.

66197665332 is an abundant number, since it is smaller than the sum of its proper divisors (101166571344).

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

66197665332 is a wasteful number, since it uses less digits than its factorization.

66197665332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343408 (or 343403 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 54.

The spelling of 66197665332 in words is "sixty-six billion, one hundred ninety-seven million, six hundred sixty-five thousand, three hundred thirty-two".