263345664 has 40 divisors (see below), whose sum is σ = 701573400. Its totient is φ = 87781376.

The previous prime is 263345659. The next prime is 263345669. The reversal of 263345664 is 466543362.

It is an interprime number because it is at equal distance from previous prime (263345659) and next prime (263345669).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263345669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84189 + ... + 87260.

It is an arithmetic number, because the mean of its divisors is an integer number (17539335).

Almost surely, 2^263345664 is an apocalyptic number.

263345664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

263345664 is an abundant number, since it is smaller than the sum of its proper divisors (438227736).

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

263345664 is an equidigital number, since it uses as much as digits as its factorization.

263345664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171470 (or 171454 counting only the distinct ones).

The product of its digits is 311040, while the sum is 39.

The square root of 263345664 is about 16227.9285184524. The cubic root of 263345664 is about 640.9764262089.

The spelling of 263345664 in words is "two hundred sixty-three million, three hundred forty-five thousand, six hundred sixty-four".