263930842564 has 27 divisors (see below), whose sum is σ = 469686426573. Its totient is φ = 129771229200.

The previous prime is 263930842561. The next prime is 263930842583. The reversal of 263930842564 is 465248039362.

The square root of 263930842564 is 513742.

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

It can be written as a sum of positive squares in only one way, i.e., 8582540164 + 255348302400 = 92642^2 + 505320^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263930842561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 62674419 + ... + 62678629.

Almost surely, 2^263930842564 is an apocalyptic number.

263930842564 is the 513742-nd square number.

It is an amenable number.

263930842564 is a deficient number, since it is larger than the sum of its proper divisors (205755584009).

263930842564 is an frugal number, since it uses more digits than its factorization.

263930842564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8548 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 263930842564 in words is "two hundred sixty-three billion, nine hundred thirty million, eight hundred forty-two thousand, five hundred sixty-four".