999999951111111 has 16 divisors (see below), whose sum is σ = 1403509374713600. Its totient is φ = 631578614361408.

The previous prime is 999999951111089. The next prime is 999999951111137. The reversal of 999999951111111 is 111111159999999.

It is not a de Polignac number, because 999999951111111 - 2²¹ = 999999949013959 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999951111311) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222469155 + ... + 226919643.

It is an arithmetic number, because the mean of its divisors is an integer number (87719335919600).

Almost surely, 2^{999999951111111} is an apocalyptic number.

999999951111111 is a deficient number, since it is larger than the sum of its proper divisors (403509423602489).

999999951111111 is a wasteful number, since it uses less digits than its factorization.

999999951111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8392518.

The product of its digits is 23914845, while the sum is 75.

The spelling of 999999951111111 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred fifty-one million, one hundred eleven thousand, one hundred eleven".