66161523 has 4 divisors (see below), whose sum is σ = 88215368. Its totient is φ = 44107680.

The previous prime is 66161521. The next prime is 66161531. The reversal of 66161523 is 32516166.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66161523 - 2¹ = 66161521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66161521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11026918 + ... + 11026923.

It is an arithmetic number, because the mean of its divisors is an integer number (22053842).

Almost surely, 2^66161523 is an apocalyptic number.

66161523 is a deficient number, since it is larger than the sum of its proper divisors (22053845).

66161523 is a wasteful number, since it uses less digits than its factorization.

66161523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22053844.

The product of its digits is 6480, while the sum is 30.

The square root of 66161523 is about 8133.9733832857. The cubic root of 66161523 is about 404.4534068281.

Adding to 66161523 its reverse (32516166), we get a palindrome (98677689).

The spelling of 66161523 in words is "sixty-six million, one hundred sixty-one thousand, five hundred twenty-three".