63432616621 has 24 divisors (see below), whose sum is σ = 71095461752. Its totient is φ = 56537395200.

The previous prime is 63432616571. The next prime is 63432616657. The reversal of 63432616621 is 12661623436.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17209766596 + 46222850025 = 131186^2 + 214995^2 .

It is not a de Polignac number, because 63432616621 - 2¹³ = 63432608429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63432611621) 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 23 ways as a sum of consecutive naturals, for example, 2296525 + ... + 2323981.

Almost surely, 2^63432616621 is an apocalyptic number.

63432616621 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

63432616621 is a deficient number, since it is larger than the sum of its proper divisors (7662845131).

63432616621 is a wasteful number, since it uses less digits than its factorization.

63432616621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27853 (or 27842 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The spelling of 63432616621 in words is "sixty-three billion, four hundred thirty-two million, six hundred sixteen thousand, six hundred twenty-one".