263557428656 has 10 divisors (see below), whose sum is σ = 510642518052. Its totient is φ = 131778714320.

The previous prime is 263557428653. The next prime is 263557428707. The reversal of 263557428656 is 656824755362.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 263557428595 and 263557428604.

It is not an unprimeable number, because it can be changed into a prime (263557428653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8236169630 + ... + 8236169661.

Almost surely, 2^263557428656 is an apocalyptic number.

It is an amenable number.

263557428656 is a deficient number, since it is larger than the sum of its proper divisors (247085089396).

263557428656 is a wasteful number, since it uses less digits than its factorization.

263557428656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16472339299 (or 16472339293 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 59.

The spelling of 263557428656 in words is "two hundred sixty-three billion, five hundred fifty-seven million, four hundred twenty-eight thousand, six hundred fifty-six".