263330728631 has 4 divisors (see below), whose sum is σ = 264801850200. Its totient is φ = 261859607064.

The previous prime is 263330728597. The next prime is 263330728643. The reversal of 263330728631 is 136827033362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136827033362 = 2 ⋅68413516681.

It is a cyclic number.

It is not a de Polignac number, because 263330728631 - 2¹⁴ = 263330712247 is a prime.

It is a super-2 number, since 2×263330728631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263330728831) 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 in 3 ways as a sum of consecutive naturals, for example, 735560516 + ... + 735560873.

It is an arithmetic number, because the mean of its divisors is an integer number (66200462550).

Almost surely, 2^263330728631 is an apocalyptic number.

263330728631 is a deficient number, since it is larger than the sum of its proper divisors (1471121569).

263330728631 is a wasteful number, since it uses less digits than its factorization.

263330728631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471121568.

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 263330728631 in words is "two hundred sixty-three billion, three hundred thirty million, seven hundred twenty-eight thousand, six hundred thirty-one".