263404979819536 has 45 divisors (see below), whose sum is σ = 513029538356349. Its totient is φ = 131013861362688.

The previous prime is 263404979819473. The next prime is 263404979819539. The reversal of 263404979819536 is 635918979404362.

The square root of 263404979819536 is 16229756.

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., 63819966787600 + 199585013031936 = 7988740^2 + 14127456^2 .

It is a super-2 number, since 2×263404979819536² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263404979819539) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12529361121 + ... + 12529382143.

It is a 1-persistent number, because it is pandigital, but 2⋅263404979819536 = 526809959639072 is not.

Almost surely, 2^{263404979819536} is an apocalyptic number.

263404979819536 is the 16229756-th square number.

It is an amenable number.

263404979819536 is a deficient number, since it is larger than the sum of its proper divisors (249624558536813).

263404979819536 is an frugal number, since it uses more digits than its factorization.

263404979819536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42440 (or 21218 counting only the distinct ones).

The product of its (nonzero) digits is 2116316160, while the sum is 76.

The spelling of 263404979819536 in words is "two hundred sixty-three trillion, four hundred four billion, nine hundred seventy-nine million, eight hundred nineteen thousand, five hundred thirty-six".