999999951111018 has 320 divisors, whose sum is σ = 2640529478087424. Its totient is φ = 278865151488000.

The previous prime is 999999951111017. The next prime is 999999951111041. The reversal of 999999951111018 is 810111159999999.

999999951111018 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 9 + 99 + 511 + 1 + 1 + 0 + 1 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (999999951111017) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 45639163483 + ... + 45639185393.

Almost surely, 2^{999999951111018} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999999951111018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320264739043712).

999999951111018 is an abundant number, since it is smaller than the sum of its proper divisors (1640529526976406).

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

999999951111018 is a wasteful number, since it uses less digits than its factorization.

999999951111018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27883 (or 27874 counting only the distinct ones).

The product of its (nonzero) digits is 191318760, while the sum is 81.

The spelling of 999999951111018 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred fifty-one million, one hundred eleven thousand, eighteen".