16344243857 has 2 divisors, whose sum is σ = 16344243858. Its totient is φ = 16344243856.

The previous prime is 16344243847. The next prime is 16344243869. The reversal of 16344243857 is 75834244361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15415457281 + 928786576 = 124159^2 + 30476^2 .

It is a cyclic number.

It is not a de Polignac number, because 16344243857 - 2⁴ = 16344243841 is a prime.

It is not a weakly prime, because it can be changed into another prime (16344243847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8172121928 + 8172121929.

It is an arithmetic number, because the mean of its divisors is an integer number (8172121929).

Almost surely, 2^16344243857 is an apocalyptic number.

It is an amenable number.

16344243857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16344243857 is an equidigital number, since it uses as much as digits as its factorization.

16344243857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 47.

The spelling of 16344243857 in words is "sixteen billion, three hundred forty-four million, two hundred forty-three thousand, eight hundred fifty-seven".