18026634661 has 16 divisors (see below), whose sum is σ = 20948798080. Its totient is φ = 15191426880.

The previous prime is 18026634649. The next prime is 18026634667. The reversal of 18026634661 is 16643662081.

It is a happy number.

It is not a de Polignac number, because 18026634661 - 2⁹ = 18026634149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18026634667) 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 in 15 ways as a sum of consecutive naturals, for example, 1127455 + ... + 1143331.

It is an arithmetic number, because the mean of its divisors is an integer number (1309299880).

Almost surely, 2^18026634661 is an apocalyptic number.

It is an amenable number.

18026634661 is a deficient number, since it is larger than the sum of its proper divisors (2922163419).

18026634661 is a wasteful number, since it uses less digits than its factorization.

18026634661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18604.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 18026634661 in words is "eighteen billion, twenty-six million, six hundred thirty-four thousand, six hundred sixty-one".