66161260199 has 4 divisors (see below), whose sum is σ = 66163666464. Its totient is φ = 66158853936.

The previous prime is 66161260163. The next prime is 66161260223. The reversal of 66161260199 is 99106216166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66161260199 - 2²⁴ = 66144482983 is a prime.

It is a super-2 number, since 2×66161260199² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161260699) 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, 1161407 + ... + 1217040.

It is an arithmetic number, because the mean of its divisors is an integer number (16540916616).

Almost surely, 2^66161260199 is an apocalyptic number.

66161260199 is a deficient number, since it is larger than the sum of its proper divisors (2406265).

66161260199 is a wasteful number, since it uses less digits than its factorization.

66161260199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406264.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 66161260199 in words is "sixty-six billion, one hundred sixty-one million, two hundred sixty thousand, one hundred ninety-nine".