66161161 has 32 divisors (see below), whose sum is σ = 80372736. Its totient is φ = 53760000.

The previous prime is 66161159. The next prime is 66161171. The reversal of 66161161 is 16116166.

It is a cyclic number.

It is not a de Polignac number, because 66161161 - 2¹ = 66161159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66161131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 585441 + ... + 585553.

It is an arithmetic number, because the mean of its divisors is an integer number (2511648).

Almost surely, 2^66161161 is an apocalyptic number.

It is an amenable number.

66161161 is a deficient number, since it is larger than the sum of its proper divisors (14211575).

66161161 is a wasteful number, since it uses less digits than its factorization.

66161161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273.

The product of its digits is 1296, while the sum is 28.

The square root of 66161161 is about 8133.9511309080. The cubic root of 66161161 is about 404.4526691768.

It can be divided in two parts, 6616 and 1161, that added together give a palindrome (7777).

The spelling of 66161161 in words is "sixty-six million, one hundred sixty-one thousand, one hundred sixty-one".