18802168641 has 9 divisors (see below), whose sum is σ = 27159282241. Its totient is φ = 12534504852.

The previous prime is 18802168633. The next prime is 18802168669. The reversal of 18802168641 is 14686120881.

The square root of 18802168641 is 137121.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18802168641 - 2³ = 18802168633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18802168631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 388510 + ... + 434216.

Almost surely, 2^18802168641 is an apocalyptic number.

18802168641 is the 137121-st square number.

18802168641 is the 68561-st centered octagonal number.

It is an amenable number.

18802168641 is a deficient number, since it is larger than the sum of its proper divisors (8357113600).

18802168641 is an frugal number, since it uses more digits than its factorization.

18802168641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91420 (or 45710 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The spelling of 18802168641 in words is "eighteen billion, eight hundred two million, one hundred sixty-eight thousand, six hundred forty-one".