18161683761 has 16 divisors (see below), whose sum is σ = 26392516416. Its totient is φ = 11041763136.

The previous prime is 18161683747. The next prime is 18161683789. The reversal of 18161683761 is 16738616181.

It is not a de Polignac number, because 18161683761 - 2¹⁸ = 18161421617 is a prime.

It is a super-2 number, since 2×18161683761² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18161683761.

It is not an unprimeable number, because it can be changed into a prime (18161683721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2802090 + ... + 2808563.

It is an arithmetic number, because the mean of its divisors is an integer number (1649532276).

Almost surely, 2^18161683761 is an apocalyptic number.

It is an amenable number.

18161683761 is a deficient number, since it is larger than the sum of its proper divisors (8230832655).

18161683761 is a wasteful number, since it uses less digits than its factorization.

18161683761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610752.

The product of its digits is 290304, while the sum is 48.

The spelling of 18161683761 in words is "eighteen billion, one hundred sixty-one million, six hundred eighty-three thousand, seven hundred sixty-one".