263840055616 has 56 divisors (see below), whose sum is σ = 541874090240. Its totient is φ = 127327334400.

The previous prime is 263840055569. The next prime is 263840055617. The reversal of 263840055616 is 616550048362.

It is a super-2 number, since 2×263840055616² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263840055617) 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, 576496 + ... + 927376.

It is an arithmetic number, because the mean of its divisors is an integer number (9676323040).

Almost surely, 2^263840055616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263840055616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270937045120).

263840055616 is an abundant number, since it is smaller than the sum of its proper divisors (278034034624).

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

263840055616 is a wasteful number, since it uses less digits than its factorization.

263840055616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351303 (or 351293 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 263840055616 in words is "two hundred sixty-three billion, eight hundred forty million, fifty-five thousand, six hundred sixteen".