646165463 has 4 divisors (see below), whose sum is σ = 657117480. Its totient is φ = 635213448.

The previous prime is 646165451. The next prime is 646165483. The reversal of 646165463 is 364561646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 364561646 = 2 ⋅182280823.

It is a cyclic number.

It is not a de Polignac number, because 646165463 - 2¹⁰ = 646164439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646165463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646165483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5475920 + ... + 5476037.

It is an arithmetic number, because the mean of its divisors is an integer number (164279370).

Almost surely, 2^646165463 is an apocalyptic number.

646165463 is a deficient number, since it is larger than the sum of its proper divisors (10952017).

646165463 is a wasteful number, since it uses less digits than its factorization.

646165463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952016.

The product of its digits is 311040, while the sum is 41.

The square root of 646165463 is about 25419.7848732046. The cubic root of 646165463 is about 864.5323468106.

The spelling of 646165463 in words is "six hundred forty-six million, one hundred sixty-five thousand, four hundred sixty-three".