16639393349 has 2 divisors, whose sum is σ = 16639393350. Its totient is φ = 16639393348.

The previous prime is 16639393319. The next prime is 16639393361. The reversal of 16639393349 is 94339393661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16114525249 + 524868100 = 126943^2 + 22910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16639393349 is a prime.

It is a super-2 number, since 2×16639393349² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16639393294 and 16639393303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16639393319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8319696674 + 8319696675.

It is an arithmetic number, because the mean of its divisors is an integer number (8319696675).

Almost surely, 2^16639393349 is an apocalyptic number.

It is an amenable number.

16639393349 is a deficient number, since it is larger than the sum of its proper divisors (1).

16639393349 is an equidigital number, since it uses as much as digits as its factorization.

16639393349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8503056, while the sum is 56.

The spelling of 16639393349 in words is "sixteen billion, six hundred thirty-nine million, three hundred ninety-three thousand, three hundred forty-nine".