15209934537649 has 2 divisors, whose sum is σ = 15209934537650. Its totient is φ = 15209934537648.

The previous prime is 15209934537571. The next prime is 15209934537653. The reversal of 15209934537649 is 94673543990251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11145448710400 + 4064485827249 = 3338480^2 + 2016057^2 .

It is a cyclic number.

It is not a de Polignac number, because 15209934537649 - 2⁷ = 15209934537521 is a prime.

It is not a weakly prime, because it can be changed into another prime (15209934537689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7604967268824 + 7604967268825.

It is an arithmetic number, because the mean of its divisors is an integer number (7604967268825).

Almost surely, 2^{15209934537649} is an apocalyptic number.

It is an amenable number.

15209934537649 is a deficient number, since it is larger than the sum of its proper divisors (1).

15209934537649 is an equidigital number, since it uses as much as digits as its factorization.

15209934537649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 220449600, while the sum is 67.

The spelling of 15209934537649 in words is "fifteen trillion, two hundred nine billion, nine hundred thirty-four million, five hundred thirty-seven thousand, six hundred forty-nine".