63921433780 has 24 divisors (see below), whose sum is σ = 142131188808. Its totient is φ = 24064539648.

The previous prime is 63921433769. The next prime is 63921433781. The reversal of 63921433780 is 8733412936.

It can be written as a sum of positive squares in 4 ways, for example, as 33830980624 + 30090453156 = 183932^2 + 173466^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 63921433780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63921433781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94001769 + ... + 94002448.

It is an arithmetic number, because the mean of its divisors is an integer number (5922132867).

Almost surely, 2^63921433780 is an apocalyptic number.

It is an amenable number.

63921433780 is an abundant number, since it is smaller than the sum of its proper divisors (78209755028).

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

63921433780 is a wasteful number, since it uses less digits than its factorization.

63921433780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188004243 (or 188004241 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 63921433780 in words is "sixty-three billion, nine hundred twenty-one million, four hundred thirty-three thousand, seven hundred eighty".