18726957871 has 4 divisors (see below), whose sum is σ = 18728868744. Its totient is φ = 18725047000.

The previous prime is 18726957853. The next prime is 18726957881. The reversal of 18726957871 is 17875962781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17875962781 = 7127 ⋅2508203.

It is a cyclic number.

It is not a de Polignac number, because 18726957871 - 2⁵ = 18726957839 is a prime.

It is a super-2 number, since 2×18726957871² (a number of 21 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 (18726957841) 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 3 ways as a sum of consecutive naturals, for example, 940660 + ... + 960361.

It is an arithmetic number, because the mean of its divisors is an integer number (4682217186).

Almost surely, 2^18726957871 is an apocalyptic number.

18726957871 is a deficient number, since it is larger than the sum of its proper divisors (1910873).

18726957871 is an equidigital number, since it uses as much as digits as its factorization.

18726957871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910872.

The product of its digits is 11854080, while the sum is 61.

The spelling of 18726957871 in words is "eighteen billion, seven hundred twenty-six million, nine hundred fifty-seven thousand, eight hundred seventy-one".