263238721963 has 8 divisors (see below), whose sum is σ = 316678161920. Its totient is φ = 213757759080.

The previous prime is 263238721939. The next prime is 263238721981. The reversal of 263238721963 is 369127832362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263238721963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263238721963.

It is not an unprimeable number, because it can be changed into a prime (263238721663) 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, 989619123 + ... + 989619388.

It is an arithmetic number, because the mean of its divisors is an integer number (39584770240).

Almost surely, 2^263238721963 is an apocalyptic number.

263238721963 is a deficient number, since it is larger than the sum of its proper divisors (53439439957).

263238721963 is a wasteful number, since it uses less digits than its factorization.

263238721963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979238537.

The product of its digits is 3919104, while the sum is 52.

The spelling of 263238721963 in words is "two hundred sixty-three billion, two hundred thirty-eight million, seven hundred twenty-one thousand, nine hundred sixty-three".