263992779864 has 96 divisors (see below), whose sum is σ = 793198785600. Its totient is φ = 78641903040.

The previous prime is 263992779859. The next prime is 263992779913. The reversal of 263992779864 is 468977299362.

263992779864 is a `hidden beast` number, since 26 + 399 + 2 + 77 + 98 + 64 = 666.

263992779864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 263992779792 and 263992779801.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2778054 + ... + 2871509.

It is an arithmetic number, because the mean of its divisors is an integer number (8262487350).

Almost surely, 2^263992779864 is an apocalyptic number.

263992779864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

263992779864 is an abundant number, since it is smaller than the sum of its proper divisors (529206005736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

263992779864 is a wasteful number, since it uses less digits than its factorization.

263992779864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5649645 (or 5649638 counting only the distinct ones).

The product of its digits is 493807104, while the sum is 72.

The spelling of 263992779864 in words is "two hundred sixty-three billion, nine hundred ninety-two million, seven hundred seventy-nine thousand, eight hundred sixty-four".