63443961840 has 80 divisors (see below), whose sum is σ = 224772899328. Its totient is φ = 14501476608.

The previous prime is 63443961797. The next prime is 63443961857. The reversal of 63443961840 is 4816934436.

63443961840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 63443961840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18880452 + ... + 18883811.

Almost surely, 2^63443961840 is an apocalyptic number.

63443961840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63443961840 is an abundant number, since it is smaller than the sum of its proper divisors (161328937488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63443961840 is a wasteful number, since it uses less digits than its factorization.

63443961840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37764286 (or 37764280 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The spelling of 63443961840 in words is "sixty-three billion, four hundred forty-three million, nine hundred sixty-one thousand, eight hundred forty".