263421081845 has 16 divisors (see below), whose sum is σ = 329872798080. Its totient is φ = 201559854144.

The previous prime is 263421081827. The next prime is 263421081881. The reversal of 263421081845 is 548180124362.

It is a cyclic number.

It is not a de Polignac number, because 263421081845 - 2¹² = 263421077749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 263421081796 and 263421081805.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1681886 + ... + 1831824.

It is an arithmetic number, because the mean of its divisors is an integer number (20617049880).

Almost surely, 2^263421081845 is an apocalyptic number.

It is an amenable number.

263421081845 is a deficient number, since it is larger than the sum of its proper divisors (66451716235).

263421081845 is a wasteful number, since it uses less digits than its factorization.

263421081845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165244.

The product of its (nonzero) digits is 368640, while the sum is 44.

The spelling of 263421081845 in words is "two hundred sixty-three billion, four hundred twenty-one million, eighty-one thousand, eight hundred forty-five".