78836394663 has 80 divisors (see below), whose sum is σ = 128786499072. Its totient is φ = 47770560000.

The previous prime is 78836394649. The next prime is 78836394667. The reversal of 78836394663 is 36649363887.

It is a happy number.

It is not a de Polignac number, because 78836394663 - 2⁴ = 78836394647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78836394663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78836394667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20311483 + ... + 20315363.

Almost surely, 2^78836394663 is an apocalyptic number.

78836394663 is a deficient number, since it is larger than the sum of its proper divisors (49950104409).

78836394663 is a wasteful number, since it uses less digits than its factorization.

78836394663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4198 (or 4189 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 63.

The spelling of 78836394663 in words is "seventy-eight billion, eight hundred thirty-six million, three hundred ninety-four thousand, six hundred sixty-three".