1463644643 has 4 divisors (see below), whose sum is σ = 1471228488. Its totient is φ = 1456060800.

The previous prime is 1463644607. The next prime is 1463644669. The reversal of 1463644643 is 3464463641.

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

It is a cyclic number.

It is not a de Polignac number, because 1463644643 - 2⁶ = 1463644579 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 1463644643.

It is not an unprimeable number, because it can be changed into a prime (1463644603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3791633 + ... + 3792018.

It is an arithmetic number, because the mean of its divisors is an integer number (367807122).

Almost surely, 2^1463644643 is an apocalyptic number.

1463644643 is a deficient number, since it is larger than the sum of its proper divisors (7583845).

1463644643 is an equidigital number, since it uses as much as digits as its factorization.

1463644643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7583844.

The product of its digits is 497664, while the sum is 41.

The square root of 1463644643 is about 38257.6089556052. The cubic root of 1463644643 is about 1135.3903947915.

The spelling of 1463644643 in words is "one billion, four hundred sixty-three million, six hundred forty-four thousand, six hundred forty-three".