66161705 has 32 divisors (see below), whose sum is σ = 89890560. Its totient is φ = 46448640.

The previous prime is 66161701. The next prime is 66161713. The reversal of 66161705 is 50716166.

66161705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66161705 - 2² = 66161701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66161701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114377 + ... + 114953.

It is an arithmetic number, because the mean of its divisors is an integer number (2809080).

Almost surely, 2^66161705 is an apocalyptic number.

It is an amenable number.

66161705 is a deficient number, since it is larger than the sum of its proper divisors (23728855).

66161705 is a wasteful number, since it uses less digits than its factorization.

66161705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 66161705 is about 8133.9845709222. The cubic root of 66161705 is about 404.4537776904.

It can be divided in two parts, 66161 and 705, that added together give a palindrome (66866).

The spelling of 66161705 in words is "sixty-six million, one hundred sixty-one thousand, seven hundred five".