18746291857 has 2 divisors, whose sum is σ = 18746291858. Its totient is φ = 18746291856.

The previous prime is 18746291849. The next prime is 18746291891. The reversal of 18746291857 is 75819264781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18669396496 + 76895361 = 136636^2 + 8769^2 .

It is a cyclic number.

It is not a de Polignac number, because 18746291857 - 2³ = 18746291849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18746291897) 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 as a sum of consecutive naturals, namely, 9373145928 + 9373145929.

It is an arithmetic number, because the mean of its divisors is an integer number (9373145929).

Almost surely, 2^18746291857 is an apocalyptic number.

It is an amenable number.

18746291857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18746291857 is an equidigital number, since it uses as much as digits as its factorization.

18746291857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 58.

The spelling of 18746291857 in words is "eighteen billion, seven hundred forty-six million, two hundred ninety-one thousand, eight hundred fifty-seven".