63021398717 has 4 divisors (see below), whose sum is σ = 66728539836. Its totient is φ = 59314257600.

The previous prime is 63021398651. The next prime is 63021398723. The reversal of 63021398717 is 71789312036.

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 25170139801 + 37851258916 = 158651^2 + 194554^2 .

It is a cyclic number.

It is not a de Polignac number, because 63021398717 - 2²⁴ = 63004621501 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 (63021391717) 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, 1853570534 + ... + 1853570567.

It is an arithmetic number, because the mean of its divisors is an integer number (16682134959).

Almost surely, 2^63021398717 is an apocalyptic number.

It is an amenable number.

63021398717 is a deficient number, since it is larger than the sum of its proper divisors (3707141119).

63021398717 is a wasteful number, since it uses less digits than its factorization.

63021398717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707141118.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 63021398717 in words is "sixty-three billion, twenty-one million, three hundred ninety-eight thousand, seven hundred seventeen".