18502287661 has 8 divisors (see below), whose sum is σ = 21736953504. Its totient is φ = 15526395120.

The previous prime is 18502287641. The next prime is 18502287677. The reversal of 18502287661 is 16678220581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18502287661 - 2⁹ = 18502287149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18502287611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64693171 + ... + 64693456.

It is an arithmetic number, because the mean of its divisors is an integer number (2717119188).

Almost surely, 2^18502287661 is an apocalyptic number.

18502287661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18502287661 is a deficient number, since it is larger than the sum of its proper divisors (3234665843).

18502287661 is a wasteful number, since it uses less digits than its factorization.

18502287661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129386651.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 18502287661 in words is "eighteen billion, five hundred two million, two hundred eighty-seven thousand, six hundred sixty-one".