78863263661585 has 24 divisors (see below), whose sum is σ = 108263286866616. Its totient is φ = 54811752468480.

The previous prime is 78863263661573. The next prime is 78863263661587. The reversal of 78863263661585 is 58516636236887.

It can be written as a sum of positive squares in 12 ways, for example, as 29313659095681 + 49549604565904 = 5414209^2 + 7039148^2 .

It is not a de Polignac number, because 78863263661585 - 2¹⁶ = 78863263596049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78863263661587) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2099083256 + ... + 2099120825.

It is an arithmetic number, because the mean of its divisors is an integer number (4510970286109).

Almost surely, 2^{78863263661585} is an apocalyptic number.

It is an amenable number.

78863263661585 is a deficient number, since it is larger than the sum of its proper divisors (29400023205031).

78863263661585 is a wasteful number, since it uses less digits than its factorization.

78863263661585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198204133 (or 4198204116 counting only the distinct ones).

The product of its digits is 2090188800, while the sum is 74.

The spelling of 78863263661585 in words is "seventy-eight trillion, eight hundred sixty-three billion, two hundred sixty-three million, six hundred sixty-one thousand, five hundred eighty-five".