999775555533111 has 16 divisors (see below), whose sum is σ = 1527832749632000. Its totient is φ = 569663353783008.

The previous prime is 999775555532953. The next prime is 999775555533137. The reversal of 999775555533111 is 111335555577999.

It is a happy number.

It is not a de Polignac number, because 999775555533111 - 2¹⁰ = 999775555532087 is a prime.

It is a super-2 number, since 2×999775555533111² (a number of 31 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999775555523111) 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, 68206811851 + ... + 68206826508.

It is an arithmetic number, because the mean of its divisors is an integer number (95489546852000).

Almost surely, 2^{999775555533111} is an apocalyptic number.

999775555533111 is a deficient number, since it is larger than the sum of its proper divisors (528057194098889).

999775555533111 is a wasteful number, since it uses less digits than its factorization.

999775555533111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136413638718.

The product of its digits is 1004653125, while the sum is 75.

The spelling of 999775555533111 in words is "nine hundred ninety-nine trillion, seven hundred seventy-five billion, five hundred fifty-five million, five hundred thirty-three thousand, one hundred eleven".