263631265220 has 24 divisors (see below), whose sum is σ = 562701490008. Its totient is φ = 103723776000.

The previous prime is 263631265213. The next prime is 263631265223. The reversal of 263631265220 is 22562136362.

It can be written as a sum of positive squares in 4 ways, for example, as 5006128516 + 258625136704 = 70754^2 + 508552^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (263631265223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108044381 + ... + 108046820.

It is an arithmetic number, because the mean of its divisors is an integer number (23445895417).

Almost surely, 2^263631265220 is an apocalyptic number.

263631265220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263631265220 is an abundant number, since it is smaller than the sum of its proper divisors (299070224788).

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

263631265220 is a wasteful number, since it uses less digits than its factorization.

263631265220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216091271 (or 216091269 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 263631265220 in words is "two hundred sixty-three billion, six hundred thirty-one million, two hundred sixty-five thousand, two hundred twenty".