1646403442563 has 16 divisors (see below), whose sum is σ = 2395276129152. Its totient is φ = 997608816000.

The previous prime is 1646403442561. The next prime is 1646403442591. The reversal of 1646403442563 is 3652443046461.

It is not a de Polignac number, because 1646403442563 - 2¹ = 1646403442561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1646403442561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5128153 + ... + 5439738.

It is an arithmetic number, because the mean of its divisors is an integer number (149704758072).

Almost surely, 2^{1646403442563} is an apocalyptic number.

1646403442563 is a deficient number, since it is larger than the sum of its proper divisors (748872686589).

1646403442563 is a wasteful number, since it uses less digits than its factorization.

1646403442563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10572626.

The product of its (nonzero) digits is 4976640, while the sum is 48.

The spelling of 1646403442563 in words is "one trillion, six hundred forty-six billion, four hundred three million, four hundred forty-two thousand, five hundred sixty-three".