18947317743 has 24 divisors (see below), whose sum is σ = 28436448768. Its totient is φ = 12607308504.

The previous prime is 18947317721. The next prime is 18947317777. The reversal of 18947317743 is 34771374981.

It is not a de Polignac number, because 18947317743 - 2¹³ = 18947309551 is a prime.

It is a super-2 number, since 2×18947317743² (a number of 21 digits) contains 22 as substring.

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 18947317743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947312743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52546 + ... + 201632.

It is an arithmetic number, because the mean of its divisors is an integer number (1184852032).

Almost surely, 2^18947317743 is an apocalyptic number.

18947317743 is a deficient number, since it is larger than the sum of its proper divisors (9489131025).

18947317743 is an equidigital number, since it uses as much as digits as its factorization.

18947317743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149625 (or 149613 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The spelling of 18947317743 in words is "eighteen billion, nine hundred forty-seven million, three hundred seventeen thousand, seven hundred forty-three".