78517578648563 has 16 divisors (see below), whose sum is σ = 79686628781760. Its totient is φ = 77356393220736.

The previous prime is 78517578648527. The next prime is 78517578648583. The reversal of 78517578648563 is 36584687571587.

It is a cyclic number.

It is not a de Polignac number, because 78517578648563 - 2⁸ = 78517578648307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78517578648583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416053781 + ... + 416242457.

It is an arithmetic number, because the mean of its divisors is an integer number (4980414298860).

Almost surely, 2^{78517578648563} is an apocalyptic number.

78517578648563 is a deficient number, since it is larger than the sum of its proper divisors (1169050133197).

78517578648563 is a wasteful number, since it uses less digits than its factorization.

78517578648563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209486.

The product of its digits is 9483264000, while the sum is 80.

The spelling of 78517578648563 in words is "seventy-eight trillion, five hundred seventeen billion, five hundred seventy-eight million, six hundred forty-eight thousand, five hundred sixty-three".