66161823 has 64 divisors (see below), whose sum is σ = 116508672. Its totient is φ = 32440320.

The previous prime is 66161813. The next prime is 66161867. The reversal of 66161823 is 32816166.

It is not a de Polignac number, because 66161823 - 2⁵ = 66161791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161803) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 257311 + ... + 257567.

It is an arithmetic number, because the mean of its divisors is an integer number (1820448).

Almost surely, 2^66161823 is an apocalyptic number.

66161823 is a deficient number, since it is larger than the sum of its proper divisors (50346849).

66161823 is a wasteful number, since it uses less digits than its factorization.

66161823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its digits is 10368, while the sum is 33.

The square root of 66161823 is about 8133.9918244365. The cubic root of 66161823 is about 404.4540181393.

Adding to 66161823 its reverse (32816166), we get a palindrome (98977989).

The spelling of 66161823 in words is "sixty-six million, one hundred sixty-one thousand, eight hundred twenty-three".