1646564063 has 4 divisors (see below), whose sum is σ = 1647279480. Its totient is φ = 1645848648.

The previous prime is 1646564027. The next prime is 1646564069. The reversal of 1646564063 is 3604656461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3604656461 = 7 ⋅514950923.

It is a cyclic number.

It is not a de Polignac number, because 1646564063 - 2⁶ = 1646563999 is a prime.

It is a super-2 number, since 2×1646564063² = 5422346427126135938, which contains 22 as substring.

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 1646564063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646564069) 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, 354245 + ... + 358862.

It is an arithmetic number, because the mean of its divisors is an integer number (411819870).

Almost surely, 2^1646564063 is an apocalyptic number.

1646564063 is a deficient number, since it is larger than the sum of its proper divisors (715417).

1646564063 is an equidigital number, since it uses as much as digits as its factorization.

1646564063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715416.

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

The square root of 1646564063 is about 40577.8765215727. The cubic root of 1646564063 is about 1180.8449523684.

The spelling of 1646564063 in words is "one billion, six hundred forty-six million, five hundred sixty-four thousand, sixty-three".