16381486685 has 8 divisors (see below), whose sum is σ = 19662735960. Its totient is φ = 13101888064.

The previous prime is 16381486651. The next prime is 16381486711. The reversal of 16381486685 is 58668418361.

It can be written as a sum of positive squares in 4 ways, for example, as 31516996 + 16349969689 = 5614^2 + 127867^2 .

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 16381486685 - 2¹² = 16381482589 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16381486685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390722 + ... + 430611.

It is an arithmetic number, because the mean of its divisors is an integer number (2457841995).

Almost surely, 2^16381486685 is an apocalyptic number.

It is an amenable number.

16381486685 is a deficient number, since it is larger than the sum of its proper divisors (3281249275).

16381486685 is an equidigital number, since it uses as much as digits as its factorization.

16381486685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825327.

The product of its digits is 6635520, while the sum is 56.

The spelling of 16381486685 in words is "sixteen billion, three hundred eighty-one million, four hundred eighty-six thousand, six hundred eighty-five".