16818869661 has 8 divisors (see below), whose sum is σ = 24463810464. Its totient is φ = 10193254320.

The previous prime is 16818869593. The next prime is 16818869687. The reversal of 16818869661 is 16696881861.

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

It is not a de Polignac number, because 16818869661 - 2¹³ = 16818861469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16818869595 and 16818869604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16818862661) 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, 254831326 + ... + 254831391.

It is an arithmetic number, because the mean of its divisors is an integer number (3057976308).

Almost surely, 2^16818869661 is an apocalyptic number.

16818869661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16818869661 is a deficient number, since it is larger than the sum of its proper divisors (7644940803).

16818869661 is a wasteful number, since it uses less digits than its factorization.

16818869661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509662731.

The product of its digits is 5971968, while the sum is 60.

The spelling of 16818869661 in words is "sixteen billion, eight hundred eighteen million, eight hundred sixty-nine thousand, six hundred sixty-one".