999953536318889 has 2 divisors, whose sum is σ = 999953536318890. Its totient is φ = 999953536318888.

The previous prime is 999953536318879. The next prime is 999953536318897. The reversal of 999953536318889 is 988813635359999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 929361747139225 + 70591789179664 = 30485435^2 + 8401892^2 .

It is a cyclic number.

It is not a de Polignac number, because 999953536318889 - 2²⁸ = 999953267883433 is a prime.

It is not a weakly prime, because it can be changed into another prime (999953536318879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499976768159444 + 499976768159445.

It is an arithmetic number, because the mean of its divisors is an integer number (499976768159445).

Almost surely, 2^{999953536318889} is an apocalyptic number.

It is an amenable number.

999953536318889 is a deficient number, since it is larger than the sum of its proper divisors (1).

999953536318889 is an equidigital number, since it uses as much as digits as its factorization.

999953536318889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122444006400, while the sum is 95.

The spelling of 999953536318889 in words is "nine hundred ninety-nine trillion, nine hundred fifty-three billion, five hundred thirty-six million, three hundred eighteen thousand, eight hundred eighty-nine".