66155193 has 12 divisors (see below), whose sum is σ = 102908260. Its totient is φ = 40710816.

The previous prime is 66155191. The next prime is 66155237. The reversal of 66155193 is 39155166.

It can be written as a sum of positive squares in 2 ways, for example, as 37124649 + 29030544 = 6093^2 + 5388^2 .

It is not a de Polignac number, because 66155193 - 2¹ = 66155191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66155191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282598 + ... + 282831.

Almost surely, 2^66155193 is an apocalyptic number.

It is an amenable number.

66155193 is a deficient number, since it is larger than the sum of its proper divisors (36753067).

66155193 is a wasteful number, since it uses less digits than its factorization.

66155193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565448 (or 565445 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 66155193 is about 8133.5842652548. The cubic root of 66155193 is about 404.4405077310.

The spelling of 66155193 in words is "sixty-six million, one hundred fifty-five thousand, one hundred ninety-three".