999940001199991 has 48 divisors (see below), whose sum is σ = 1069118345254080. Its totient is φ = 935010633623040.

The previous prime is 999940001199989. The next prime is 999940001200003. The reversal of 999940001199991 is 199991100049999.

It is a Cunningham number, because it is equal to 99998³-1.

It is not a de Polignac number, because 999940001199991 - 2¹ = 999940001199989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999940002199991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62531416006 + ... + 62531431996.

It is an arithmetic number, because the mean of its divisors is an integer number (22273298859460).

Almost surely, 2^{999940001199991} is an apocalyptic number.

999940001199991 is a deficient number, since it is larger than the sum of its proper divisors (69178344054089).

999940001199991 is a wasteful number, since it uses less digits than its factorization.

999940001199991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22152 (or 22133 counting only the distinct ones).

The product of its (nonzero) digits is 172186884, while the sum is 79.

The spelling of 999940001199991 in words is "nine hundred ninety-nine trillion, nine hundred forty billion, one million, one hundred ninety-nine thousand, nine hundred ninety-one".