263586747649 has 3 divisors (see below), whose sum is σ = 263587261057. Its totient is φ = 263586234242.

The previous prime is 263586747637. The next prime is 263586747653. The reversal of 263586747649 is 946747685362.

The square root of 263586747649 is 513407.

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 a de Polignac number, because none of the positive numbers 2^k-263586747649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263586747689) 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, 256704 + ... + 770110.

Almost surely, 2^263586747649 is an apocalyptic number.

263586747649 is the 513407-th square number.

263586747649 is the 256704-th centered octagonal number.

It is an amenable number.

263586747649 is a deficient number, since it is larger than the sum of its proper divisors (513408).

263586747649 is an frugal number, since it uses more digits than its factorization.

263586747649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026814 (or 513407 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 67.

The spelling of 263586747649 in words is "two hundred sixty-three billion, five hundred eighty-six million, seven hundred forty-seven thousand, six hundred forty-nine".