263423947653 has 12 divisors (see below), whose sum is σ = 389781776748. Its totient is φ = 171332648640.

The previous prime is 263423947649. The next prime is 263423947667. The reversal of 263423947653 is 356749324362.

263423947653 is a `hidden beast` number, since 2 + 63 + 423 + 94 + 76 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6454033569 + 256969914084 = 80337^2 + 506922^2 .

It is not a de Polignac number, because 263423947653 - 2² = 263423947649 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 263423947653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263423947153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356942650 + ... + 356943387.

It is an arithmetic number, because the mean of its divisors is an integer number (32481814729).

Almost surely, 2^263423947653 is an apocalyptic number.

It is an amenable number.

263423947653 is a deficient number, since it is larger than the sum of its proper divisors (126357829095).

263423947653 is a wasteful number, since it uses less digits than its factorization.

263423947653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713886084 (or 713886081 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 54.

The spelling of 263423947653 in words is "two hundred sixty-three billion, four hundred twenty-three million, nine hundred forty-seven thousand, six hundred fifty-three".