18783746757 has 12 divisors (see below), whose sum is σ = 27136294380. Its totient is φ = 12520552128.

The previous prime is 18783746753. The next prime is 18783746771. The reversal of 18783746757 is 75764738781.

It can be written as a sum of positive squares in 2 ways, for example, as 6755360481 + 12028386276 = 82191^2 + 109674^2 .

It is not a de Polignac number, because 18783746757 - 2² = 18783746753 is a prime.

It is a super-2 number, since 2×18783746757² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18783746694 and 18783746703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18783746753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99738 + ... + 217979.

It is an arithmetic number, because the mean of its divisors is an integer number (2261357865).

Almost surely, 2^18783746757 is an apocalyptic number.

It is an amenable number.

18783746757 is a deficient number, since it is larger than the sum of its proper divisors (8352547623).

18783746757 is a wasteful number, since it uses less digits than its factorization.

18783746757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324292 (or 324289 counting only the distinct ones).

The product of its digits is 55319040, while the sum is 63.

The spelling of 18783746757 in words is "eighteen billion, seven hundred eighty-three million, seven hundred forty-six thousand, seven hundred fifty-seven".