18901518106 has 4 divisors (see below), whose sum is σ = 28352277162. Its totient is φ = 9450759052.

The previous prime is 18901518061. The next prime is 18901518113. The reversal of 18901518106 is 60181510981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60181510981 = 401 ⋅150078581.

It can be written as a sum of positive squares in only one way, i.e., 16559829225 + 2341688881 = 128685^2 + 48391^2 .

It is a super-2 number, since 2×18901518106² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 4725379525 + ... + 4725379528.

Almost surely, 2^18901518106 is an apocalyptic number.

18901518106 is a deficient number, since it is larger than the sum of its proper divisors (9450759056).

18901518106 is an equidigital number, since it uses as much as digits as its factorization.

18901518106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9450759055.

The product of its (nonzero) digits is 17280, while the sum is 40.

The spelling of 18901518106 in words is "eighteen billion, nine hundred one million, five hundred eighteen thousand, one hundred six".