999718019880 has 64 divisors (see below), whose sum is σ = 2999232048960. Its totient is φ = 266584539648.

The previous prime is 999718019857. The next prime is 999718020011. The reversal of 999718019880 is 88910817999.

It is a Cunningham number, because it is equal to 999859²-1.

It is a super-5 number, since 5×999718019880⁵ (a number of 61 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5915839 + ... + 6082481.

It is an arithmetic number, because the mean of its divisors is an integer number (46863000765).

Almost surely, 2^999718019880 is an apocalyptic number.

It is an amenable number.

999718019880 is an abundant number, since it is smaller than the sum of its proper divisors (1999514029080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999718019880 is a wasteful number, since it uses less digits than its factorization.

999718019880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216650 (or 216646 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 69.

The spelling of 999718019880 in words is "nine hundred ninety-nine billion, seven hundred eighteen million, nineteen thousand, eight hundred eighty".