263787778816 has 72 divisors (see below), whose sum is σ = 546276946320. Its totient is φ = 126977593344.

The previous prime is 263787778781. The next prime is 263787778843. The reversal of 263787778816 is 618877787362.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2524930 + ... + 2627326.

It is an arithmetic number, because the mean of its divisors is an integer number (7587179810).

Almost surely, 2^263787778816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263787778816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273138473160).

263787778816 is an abundant number, since it is smaller than the sum of its proper divisors (282489167504).

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

263787778816 is a wasteful number, since it uses less digits than its factorization.

263787778816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102789 (or 102775 counting only the distinct ones).

The product of its digits is 265531392, while the sum is 70.

The spelling of 263787778816 in words is "two hundred sixty-three billion, seven hundred eighty-seven million, seven hundred seventy-eight thousand, eight hundred sixteen".