263250645640 has 16 divisors (see below), whose sum is σ = 592313952780. Its totient is φ = 105300258240.

The previous prime is 263250645631. The next prime is 263250645653. The reversal of 263250645640 is 46546052362.

It can be written as a sum of positive squares in 2 ways, for example, as 218195488996 + 45055156644 = 467114^2 + 212262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3290633031 + ... + 3290633110.

Almost surely, 2^263250645640 is an apocalyptic number.

263250645640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263250645640 is an abundant number, since it is smaller than the sum of its proper divisors (329063307140).

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

263250645640 is a wasteful number, since it uses less digits than its factorization.

263250645640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6581266152 (or 6581266148 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 263250645640 in words is "two hundred sixty-three billion, two hundred fifty million, six hundred forty-five thousand, six hundred forty".