16139923849 has 9 divisors (see below), whose sum is σ = 18776048007. Its totient is φ = 13833458184.

The previous prime is 16139923801. The next prime is 16139923853. The reversal of 16139923849 is 94832993161.

It is a happy number.

The square root of 16139923849 is 127043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4609459449 + 11530464400 = 67893^2 + 107380^2 .

It is not a de Polignac number, because 16139923849 - 2¹³ = 16139915657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16139923849.

It is not an unprimeable number, because it can be changed into a prime (16139923949) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 880227 + ... + 898375.

Almost surely, 2^16139923849 is an apocalyptic number.

16139923849 is the 127043-rd square number.

16139923849 is the 63522-nd centered octagonal number.

It is an amenable number.

16139923849 is a deficient number, since it is larger than the sum of its proper divisors (2636124158).

16139923849 is an frugal number, since it uses more digits than its factorization.

16139923849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36312 (or 18156 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 55.

The spelling of 16139923849 in words is "sixteen billion, one hundred thirty-nine million, nine hundred twenty-three thousand, eight hundred forty-nine".