63198442072721 has 4 divisors (see below), whose sum is σ = 63198499151844. Its totient is φ = 63198384993600.

The previous prime is 63198442072693. The next prime is 63198442072763. The reversal of 63198442072721 is 12727024489136.

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 27073966660225 + 36124475412496 = 5203265^2 + 6010364^2 .

It is a cyclic number.

It is not a de Polignac number, because 63198442072721 - 2⁶ = 63198442072657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63198442072621) 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, 26845220 + ... + 29104341.

It is an arithmetic number, because the mean of its divisors is an integer number (15799624787961).

Almost surely, 2^{63198442072721} is an apocalyptic number.

It is an amenable number.

63198442072721 is a deficient number, since it is larger than the sum of its proper divisors (57079123).

63198442072721 is a wasteful number, since it uses less digits than its factorization.

63198442072721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57079122.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 63198442072721 in words is "sixty-three trillion, one hundred ninety-eight billion, four hundred forty-two million, seventy-two thousand, seven hundred twenty-one".