999999950945581 has 2 divisors, whose sum is σ = 999999950945582. Its totient is φ = 999999950945580.

The previous prime is 999999950945579. The next prime is 999999950945609. The reversal of 999999950945581 is 185549059999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517524053214025 + 482475897731556 = 22749155^2 + 21965334^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999950945581 - 2¹ = 999999950945579 is a prime.

It is a super-2 number, since 2×999999950945581² (a number of 31 digits) contains 22 as substring.

Together with 999999950945579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999950945531) 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, 499999975472790 + 499999975472791.

It is an arithmetic number, because the mean of its divisors is an integer number (499999975472791).

Almost surely, 2^{999999950945581} is an apocalyptic number.

It is an amenable number.

999999950945581 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999950945581 is an equidigital number, since it uses as much as digits as its factorization.

999999950945581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172186884000, while the sum is 100.

The spelling of 999999950945581 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred fifty million, nine hundred forty-five thousand, five hundred eighty-one".