78863263661386 has 4 divisors (see below), whose sum is σ = 118294895492082. Its totient is φ = 39431631830692.

The previous prime is 78863263661383. The next prime is 78863263661419. The reversal of 78863263661386 is 68316636236887.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71754774530761 + 7108489130625 = 8470819^2 + 2666175^2 .

It is not an unprimeable number, because it can be changed into a prime (78863263661383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19715815915345 + ... + 19715815915348.

Almost surely, 2^{78863263661386} is an apocalyptic number.

78863263661386 is a deficient number, since it is larger than the sum of its proper divisors (39431631830696).

78863263661386 is a wasteful number, since it uses less digits than its factorization.

78863263661386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39431631830695.

The product of its digits is 1504935936, while the sum is 73.

The spelling of 78863263661386 in words is "seventy-eight trillion, eight hundred sixty-three billion, two hundred sixty-three million, six hundred sixty-one thousand, three hundred eighty-six".