77993578663 has 48 divisors (see below), whose sum is σ = 110264384160. Its totient is φ = 54164678400.

The previous prime is 77993578643. The next prime is 77993578679. The reversal of 77993578663 is 36687539977.

It is not a de Polignac number, because 77993578663 - 2¹⁷ = 77993447591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77993578592 and 77993578601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77993578613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11293 + ... + 395113.

It is an arithmetic number, because the mean of its divisors is an integer number (2297174670).

Almost surely, 2^77993578663 is an apocalyptic number.

77993578663 is a deficient number, since it is larger than the sum of its proper divisors (32270805497).

77993578663 is a wasteful number, since it uses less digits than its factorization.

77993578663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383888 (or 383881 counting only the distinct ones).

The product of its digits is 360067680, while the sum is 70.

It can be divided in two parts, 77993 and 578663, that added together give a palindrome (656656).

The spelling of 77993578663 in words is "seventy-seven billion, nine hundred ninety-three million, five hundred seventy-eight thousand, six hundred sixty-three".