263875252640 has 48 divisors (see below), whose sum is σ = 623526302952. Its totient is φ = 105529611264.

The previous prime is 263875252639. The next prime is 263875252643. The reversal of 263875252640 is 46252578362.

It can be written as a sum of positive squares in 4 ways, for example, as 261133264144 + 2741988496 = 511012^2 + 52364^2 .

It is not an unprimeable number, because it can be changed into a prime (263875252643) 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, 680462 + ... + 995378.

Almost surely, 2^263875252640 is an apocalyptic number.

263875252640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263875252640 is an abundant number, since it is smaller than the sum of its proper divisors (359651050312).

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

263875252640 is a wasteful number, since it uses less digits than its factorization.

263875252640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320169 (or 320161 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 263875252640 in words is "two hundred sixty-three billion, eight hundred seventy-five million, two hundred fifty-two thousand, six hundred forty".