16639125149 has 2 divisors, whose sum is σ = 16639125150. Its totient is φ = 16639125148.

The previous prime is 16639125137. The next prime is 16639125179. The reversal of 16639125149 is 94152193661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10379941924 + 6259183225 = 101882^2 + 79115^2 .

It is a cyclic number.

It is not a de Polignac number, because 16639125149 - 2¹² = 16639121053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16639125179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8319562574 + 8319562575.

It is an arithmetic number, because the mean of its divisors is an integer number (8319562575).

Almost surely, 2^16639125149 is an apocalyptic number.

It is an amenable number.

16639125149 is a deficient number, since it is larger than the sum of its proper divisors (1).

16639125149 is an equidigital number, since it uses as much as digits as its factorization.

16639125149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The spelling of 16639125149 in words is "sixteen billion, six hundred thirty-nine million, one hundred twenty-five thousand, one hundred forty-nine".