999972501608569 has 2 divisors, whose sum is σ = 999972501608570. Its totient is φ = 999972501608568.

The previous prime is 999972501608513. The next prime is 999972501608573. The reversal of 999972501608569 is 965806105279999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995142229515625 + 4830272092944 = 31545875^2 + 2197788^2 .

It is a cyclic number.

It is not a de Polignac number, because 999972501608569 - 2⁷ = 999972501608441 is a prime.

It is a super-2 number, since 2×999972501608569² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999972501608869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499986250804284 + 499986250804285.

It is an arithmetic number, because the mean of its divisors is an integer number (499986250804285).

Almost surely, 2^{999972501608569} is an apocalyptic number.

It is an amenable number.

999972501608569 is a deficient number, since it is larger than the sum of its proper divisors (1).

999972501608569 is an equidigital number, since it uses as much as digits as its factorization.

999972501608569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5952139200, while the sum is 85.

The spelling of 999972501608569 in words is "nine hundred ninety-nine trillion, nine hundred seventy-two billion, five hundred one million, six hundred eight thousand, five hundred sixty-nine".