263545676689 has 3 divisors (see below), whose sum is σ = 263546190057. Its totient is φ = 263545163322.

The previous prime is 263545676687. The next prime is 263545676701. The reversal of 263545676689 is 986676545362.

The square root of 263545676689 is 513367.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 263545676689 - 2¹ = 263545676687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263545676687) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 256684 + ... + 770050.

It is an arithmetic number, because the mean of its divisors is an integer number (87848730019).

Almost surely, 2^263545676689 is an apocalyptic number.

263545676689 is the 513367-th square number.

263545676689 is the 256684-th centered octagonal number.

It is an amenable number.

263545676689 is a deficient number, since it is larger than the sum of its proper divisors (513368).

263545676689 is an frugal number, since it uses more digits than its factorization.

263545676689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026734 (or 513367 counting only the distinct ones).

The product of its digits is 391910400, while the sum is 67.

The spelling of 263545676689 in words is "two hundred sixty-three billion, five hundred forty-five million, six hundred seventy-six thousand, six hundred eighty-nine".