646141352165 has 4 divisors (see below), whose sum is σ = 775369622604. Its totient is φ = 516913081728.

The previous prime is 646141352159. The next prime is 646141352167. The reversal of 646141352165 is 561253141646.

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

It can be written as a sum of positive squares in 2 ways, for example, as 179730210916 + 466411141249 = 423946^2 + 682943^2 .

It is a cyclic number.

It is not a de Polignac number, because 646141352165 - 2¹⁴ = 646141335781 is a prime.

It is a super-2 number, since 2×646141352165² (a number of 24 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 (646141352167) 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, 64614135212 + ... + 64614135221.

It is an arithmetic number, because the mean of its divisors is an integer number (193842405651).

Almost surely, 2^646141352165 is an apocalyptic number.

It is an amenable number.

646141352165 is a deficient number, since it is larger than the sum of its proper divisors (129228270439).

646141352165 is a wasteful number, since it uses less digits than its factorization.

646141352165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129228270438.

The product of its digits is 518400, while the sum is 44.

The spelling of 646141352165 in words is "six hundred forty-six billion, one hundred forty-one million, three hundred fifty-two thousand, one hundred sixty-five".