63434644021 has 4 divisors (see below), whose sum is σ = 72496736032. Its totient is φ = 54372552012.

The previous prime is 63434643907. The next prime is 63434644037. The reversal of 63434644021 is 12044643436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63434644021 - 2³¹ = 61287160373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63434644121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4531045995 + ... + 4531046008.

It is an arithmetic number, because the mean of its divisors is an integer number (18124184008).

Almost surely, 2^63434644021 is an apocalyptic number.

It is an amenable number.

63434644021 is a deficient number, since it is larger than the sum of its proper divisors (9062092011).

63434644021 is an equidigital number, since it uses as much as digits as its factorization.

63434644021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9062092010.

The product of its (nonzero) digits is 165888, while the sum is 37.

It can be divided in two parts, 63434 and 644021, that added together give a triangular number (707455 = T₁₁₈₉).

The spelling of 63434644021 in words is "sixty-three billion, four hundred thirty-four million, six hundred forty-four thousand, twenty-one".