16645140349 has 2 divisors, whose sum is σ = 16645140350. Its totient is φ = 16645140348.

The previous prime is 16645140277. The next prime is 16645140431. The reversal of 16645140349 is 94304154661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13361048100 + 3284092249 = 115590^2 + 57307^2 .

It is a cyclic number.

It is not a de Polignac number, because 16645140349 - 2⁹ = 16645139837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16645140749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322570174 + 8322570175.

It is an arithmetic number, because the mean of its divisors is an integer number (8322570175).

Almost surely, 2^16645140349 is an apocalyptic number.

It is an amenable number.

16645140349 is a deficient number, since it is larger than the sum of its proper divisors (1).

16645140349 is an equidigital number, since it uses as much as digits as its factorization.

16645140349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 16645140349 in words is "sixteen billion, six hundred forty-five million, one hundred forty thousand, three hundred forty-nine".