63739880721 has 32 divisors (see below), whose sum is σ = 103271034240. Its totient is φ = 38533824000.

The previous prime is 63739880713. The next prime is 63739880747. The reversal of 63739880721 is 12708893736.

63739880721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63739880721 - 2³ = 63739880713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63739880761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148500 + ... + 386693.

It is an arithmetic number, because the mean of its divisors is an integer number (3227219820).

Almost surely, 2^63739880721 is an apocalyptic number.

It is an amenable number.

63739880721 is a deficient number, since it is larger than the sum of its proper divisors (39531153519).

63739880721 is a wasteful number, since it uses less digits than its factorization.

63739880721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535614 (or 535608 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 63739880721 in words is "sixty-three billion, seven hundred thirty-nine million, eight hundred eighty thousand, seven hundred twenty-one".