263197421568 has 156 divisors (see below), whose sum is σ = 800270856840. Its totient is φ = 83114754048.

The previous prime is 263197421561. The next prime is 263197421579. The reversal of 263197421568 is 865124791362.

It is a happy number.

263197421568 is a `hidden beast` number, since 2 + 6 + 3 + 1 + 9 + 74 + 2 + 1 + 568 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263197421561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 512530 + ... + 888302.

It is an arithmetic number, because the mean of its divisors is an integer number (5129941390).

Almost surely, 2^263197421568 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 263197421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (400135428420).

263197421568 is an abundant number, since it is smaller than the sum of its proper divisors (537073435272).

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

263197421568 is a wasteful number, since it uses less digits than its factorization.

263197421568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375822 (or 375797 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 263197421568 in words is "two hundred sixty-three billion, one hundred ninety-seven million, four hundred twenty-one thousand, five hundred sixty-eight".