63366390721 has 4 divisors (see below), whose sum is σ = 63554421892. Its totient is φ = 63178359552.

The previous prime is 63366390691. The next prime is 63366390727. The reversal of 63366390721 is 12709366336.

63366390721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43581155121 + 19785235600 = 208761^2 + 140660^2 .

It is a cyclic number.

It is not a de Polignac number, because 63366390721 - 2⁹ = 63366390209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63366390727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94015080 + ... + 94015753.

It is an arithmetic number, because the mean of its divisors is an integer number (15888605473).

Almost surely, 2^63366390721 is an apocalyptic number.

It is an amenable number.

63366390721 is a deficient number, since it is larger than the sum of its proper divisors (188031171).

63366390721 is a wasteful number, since it uses less digits than its factorization.

63366390721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188031170.

The product of its (nonzero) digits is 734832, while the sum is 46.

The spelling of 63366390721 in words is "sixty-three billion, three hundred sixty-six million, three hundred ninety thousand, seven hundred twenty-one".