63078538217 has 4 divisors (see below), whose sum is σ = 64112612676. Its totient is φ = 62044463760.

The previous prime is 63078538213. The next prime is 63078538223. The reversal of 63078538217 is 71283587036.

It is a happy number.

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 29775573136 + 33302965081 = 172556^2 + 182491^2 .

It is a cyclic number.

It is not a de Polignac number, because 63078538217 - 2² = 63078538213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63078538213) 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, 517037138 + ... + 517037259.

It is an arithmetic number, because the mean of its divisors is an integer number (16028153169).

Almost surely, 2^63078538217 is an apocalyptic number.

It is an amenable number.

63078538217 is a deficient number, since it is larger than the sum of its proper divisors (1034074459).

63078538217 is a wasteful number, since it uses less digits than its factorization.

63078538217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034074458.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 63078538217 in words is "sixty-three billion, seventy-eight million, five hundred thirty-eight thousand, two hundred seventeen".