15859842049 has 2 divisors, whose sum is σ = 15859842050. Its totient is φ = 15859842048.

The previous prime is 15859842041. The next prime is 15859842067. The reversal of 15859842049 is 94024895851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8207091649 + 7652750400 = 90593^2 + 87480^2 .

It is a cyclic number.

It is not a de Polignac number, because 15859842049 - 2³ = 15859842041 is a prime.

It is not a weakly prime, because it can be changed into another prime (15859842041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7929921024 + 7929921025.

It is an arithmetic number, because the mean of its divisors is an integer number (7929921025).

Almost surely, 2^15859842049 is an apocalyptic number.

It is an amenable number.

15859842049 is a deficient number, since it is larger than the sum of its proper divisors (1).

15859842049 is an equidigital number, since it uses as much as digits as its factorization.

15859842049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 15859842049 in words is "fifteen billion, eight hundred fifty-nine million, eight hundred forty-two thousand, forty-nine".