18878589101 has 2 divisors, whose sum is σ = 18878589102. Its totient is φ = 18878589100.

The previous prime is 18878589089. The next prime is 18878589109. The reversal of 18878589101 is 10198587881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9991002025 + 8887587076 = 99955^2 + 94274^2 .

It is a cyclic number.

It is not a de Polignac number, because 18878589101 - 2²² = 18874394797 is a prime.

It is a super-2 number, since 2×18878589101² (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 (18878589109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439294550 + 9439294551.

It is an arithmetic number, because the mean of its divisors is an integer number (9439294551).

Almost surely, 2^18878589101 is an apocalyptic number.

It is an amenable number.

18878589101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878589101 is an equidigital number, since it uses as much as digits as its factorization.

18878589101 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 18878589101 in words is "eighteen billion, eight hundred seventy-eight million, five hundred eighty-nine thousand, one hundred one".