263155668 has 12 divisors (see below), whose sum is σ = 614029920. Its totient is φ = 87718552.

The previous prime is 263155667. The next prime is 263155691. The reversal of 263155668 is 866551362.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263155661) 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, 10964808 + ... + 10964831.

It is an arithmetic number, because the mean of its divisors is an integer number (51169160).

Almost surely, 2^263155668 is an apocalyptic number.

It is an amenable number.

263155668 is an abundant number, since it is smaller than the sum of its proper divisors (350874252).

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

263155668 is a wasteful number, since it uses less digits than its factorization.

263155668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21929646 (or 21929644 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 263155668 is about 16222.0734802922. The cubic root of 263155668 is about 640.8222406990.

The spelling of 263155668 in words is "two hundred sixty-three million, one hundred fifty-five thousand, six hundred sixty-eight".