18887601493 has 2 divisors, whose sum is σ = 18887601494. Its totient is φ = 18887601492.

The previous prime is 18887601437. The next prime is 18887601497. The reversal of 18887601493 is 39410678881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10217570724 + 8670030769 = 101082^2 + 93113^2 .

It is a cyclic number.

It is not a de Polignac number, because 18887601493 - 2¹³ = 18887593301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18887601497) 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, 9443800746 + 9443800747.

It is an arithmetic number, because the mean of its divisors is an integer number (9443800747).

Almost surely, 2^18887601493 is an apocalyptic number.

It is an amenable number.

18887601493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18887601493 is an equidigital number, since it uses as much as digits as its factorization.

18887601493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 18887601493 in words is "eighteen billion, eight hundred eighty-seven million, six hundred one thousand, four hundred ninety-three".