18857881019 has 2 divisors, whose sum is σ = 18857881020. Its totient is φ = 18857881018.

The previous prime is 18857880961. The next prime is 18857881027. The reversal of 18857881019 is 91018875881.

It is a strong prime.

It is an emirp because it is prime and its reverse (91018875881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18857881019 - 2¹² = 18857876923 is a prime.

It is a super-2 number, since 2×18857881019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18857811019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428940509 + 9428940510.

It is an arithmetic number, because the mean of its divisors is an integer number (9428940510).

Almost surely, 2^18857881019 is an apocalyptic number.

18857881019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857881019 is an equidigital number, since it uses as much as digits as its factorization.

18857881019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 56.

The spelling of 18857881019 in words is "eighteen billion, eight hundred fifty-seven million, eight hundred eighty-one thousand, nineteen".