16723361381 has 4 divisors (see below), whose sum is σ = 16792753164. Its totient is φ = 16653969600.

The previous prime is 16723361359. The next prime is 16723361399. The reversal of 16723361381 is 18316332761.

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: 18316332761 = 43 ⋅425961227.

It can be written as a sum of positive squares in 2 ways, for example, as 9093338881 + 7630022500 = 95359^2 + 87350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16723361381 is a prime.

It is a super-2 number, since 2×16723361381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16723361351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34695530 + ... + 34696011.

It is an arithmetic number, because the mean of its divisors is an integer number (4198188291).

Almost surely, 2^16723361381 is an apocalyptic number.

It is an amenable number.

16723361381 is a deficient number, since it is larger than the sum of its proper divisors (69391783).

16723361381 is an equidigital number, since it uses as much as digits as its factorization.

16723361381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69391782.

The product of its digits is 108864, while the sum is 41.

The spelling of 16723361381 in words is "sixteen billion, seven hundred twenty-three million, three hundred sixty-one thousand, three hundred eighty-one".