999953670536549 has 2 divisors, whose sum is σ = 999953670536550. Its totient is φ = 999953670536548.

The previous prime is 999953670536539. The next prime is 999953670536663. The reversal of 999953670536549 is 945635076359999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 987207413900449 + 12746256636100 = 31419857^2 + 3570190^2 .

It is an emirp because it is prime and its reverse (945635076359999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999953670536549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999953670536539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499976835268274 + 499976835268275.

It is an arithmetic number, because the mean of its divisors is an integer number (499976835268275).

Almost surely, 2^{999953670536549} is an apocalyptic number.

It is an amenable number.

999953670536549 is a deficient number, since it is larger than the sum of its proper divisors (1).

999953670536549 is an equidigital number, since it uses as much as digits as its factorization.

999953670536549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66961566000, while the sum is 89.

The spelling of 999953670536549 in words is "nine hundred ninety-nine trillion, nine hundred fifty-three billion, six hundred seventy million, five hundred thirty-six thousand, five hundred forty-nine".