18713772722 has 6 divisors (see below), whose sum is σ = 28070949279. Its totient is φ = 9356789630.

The previous prime is 18713772713. The next prime is 18713772757. The reversal of 18713772722 is 22727731781.

It can be written as a sum of positive squares in only one way, i.e., 9356886361 + 9356886361 = 96731^2 + 96731^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=96731.

It is a super-3 number, since 3×18713772722³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 145097 + ... + 241827.

Almost surely, 2^18713772722 is an apocalyptic number.

18713772722 is a deficient number, since it is larger than the sum of its proper divisors (9357176557).

18713772722 is an frugal number, since it uses more digits than its factorization.

18713772722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193464 (or 96733 counting only the distinct ones).

The product of its digits is 460992, while the sum is 47.

The spelling of 18713772722 in words is "eighteen billion, seven hundred thirteen million, seven hundred seventy-two thousand, seven hundred twenty-two".