16381229693 has 4 divisors (see below), whose sum is σ = 16543420188. Its totient is φ = 16219039200.

The previous prime is 16381229633. The next prime is 16381229701. The reversal of 16381229693 is 39692218361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39692218361 = 101 ⋅392992261.

It can be written as a sum of positive squares in 2 ways, for example, as 14031113209 + 2350116484 = 118453^2 + 48478^2 .

It is a cyclic number.

It is not a de Polignac number, because 16381229693 - 2¹⁴ = 16381213309 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 (16381229633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81095096 + ... + 81095297.

It is an arithmetic number, because the mean of its divisors is an integer number (4135855047).

Almost surely, 2^16381229693 is an apocalyptic number.

It is an amenable number.

16381229693 is a deficient number, since it is larger than the sum of its proper divisors (162190495).

16381229693 is a wasteful number, since it uses less digits than its factorization.

16381229693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162190494.

The product of its digits is 839808, while the sum is 50.

The spelling of 16381229693 in words is "sixteen billion, three hundred eighty-one million, two hundred twenty-nine thousand, six hundred ninety-three".