263572720640 has 88 divisors (see below), whose sum is σ = 641171689632. Its totient is φ = 103944028160.

The previous prime is 263572720639. The next prime is 263572720681. The reversal of 263572720640 is 46027275362.

It is a junction number, because it is equal to n+sod(n) for n = 263572720591 and 263572720600.

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, 992 + ... + 726048.

Almost surely, 2^263572720640 is an apocalyptic number.

263572720640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263572720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320585844816).

263572720640 is an abundant number, since it is smaller than the sum of its proper divisors (377598968992).

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

263572720640 is an equidigital number, since it uses as much as digits as its factorization.

263572720640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725153 (or 725135 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 44.

The spelling of 263572720640 in words is "two hundred sixty-three billion, five hundred seventy-two million, seven hundred twenty thousand, six hundred forty".