18878855293 has 2 divisors, whose sum is σ = 18878855294. Its totient is φ = 18878855292.

The previous prime is 18878855287. The next prime is 18878855299. The reversal of 18878855293 is 39255887881.

It is a balanced prime because it is at equal distance from previous prime (18878855287) and next prime (18878855299).

It can be written as a sum of positive squares in only one way, i.e., 18150017284 + 728838009 = 134722^2 + 26997^2 .

It is a cyclic number.

It is not a de Polignac number, because 18878855293 - 2¹³ = 18878847101 is a prime.

It is a super-2 number, since 2×18878855293² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18878855299) by changing a digit.

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 as a sum of consecutive naturals, namely, 9439427646 + 9439427647.

It is an arithmetic number, because the mean of its divisors is an integer number (9439427647).

Almost surely, 2^18878855293 is an apocalyptic number.

It is an amenable number.

18878855293 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878855293 is an equidigital number, since it uses as much as digits as its factorization.

18878855293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38707200, while the sum is 64.

The spelling of 18878855293 in words is "eighteen billion, eight hundred seventy-eight million, eight hundred fifty-five thousand, two hundred ninety-three".