263904128656 has 75 divisors (see below), whose sum is σ = 596725468553. Its totient is φ = 113058617280.

The previous prime is 263904128561. The next prime is 263904128693. The reversal of 263904128656 is 656821409362.

The square root of 263904128656 is 513716.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 217420768656 + 46483360000 = 466284^2 + 215600^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 100687026 + ... + 100689646.

Almost surely, 2^263904128656 is an apocalyptic number.

263904128656 is the 513716-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263904128656

263904128656 is an abundant number, since it is smaller than the sum of its proper divisors (332821339897).

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

263904128656 is an frugal number, since it uses more digits than its factorization.

263904128656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278 (or 2630 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 263904128656 in words is "two hundred sixty-three billion, nine hundred four million, one hundred twenty-eight thousand, six hundred fifty-six".