646279796171 has 4 divisors (see below), whose sum is σ = 646303089000. Its totient is φ = 646256503344.

The previous prime is 646279796161. The next prime is 646279796221. The reversal of 646279796171 is 171697972646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171697972646 = 2 ⋅85848986323.

It is a cyclic number.

It is not a de Polignac number, because 646279796171 - 2¹⁴ = 646279779787 is a prime.

It is a super-2 number, since 2×646279796171² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646279796098 and 646279796107.

It is not an unprimeable number, because it can be changed into a prime (646279796161) 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, 11604746 + ... + 11660303.

It is an arithmetic number, because the mean of its divisors is an integer number (161575772250).

Almost surely, 2^646279796171 is an apocalyptic number.

646279796171 is a deficient number, since it is larger than the sum of its proper divisors (23292829).

646279796171 is a wasteful number, since it uses less digits than its factorization.

646279796171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23292828.

The product of its digits is 48009024, while the sum is 65.

The spelling of 646279796171 in words is "six hundred forty-six billion, two hundred seventy-nine million, seven hundred ninety-six thousand, one hundred seventy-one".