999999999999955 has 8 divisors (see below), whose sum is σ = 1212371134021152. Its totient is φ = 791752577319168.

The previous prime is 999999999999947. The next prime is 999999999999989. The reversal of 999999999999955 is 559999999999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999999999999955 - 2³ = 999999999999947 is a prime.

It is a super-9 number, since 9×999999999999955⁹ (a number of 136 digits) contains 999999999 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030927834567 + ... + 1030927835536.

It is an arithmetic number, because the mean of its divisors is an integer number (151546391752644).

Almost surely, 2^{999999999999955} is an apocalyptic number.

999999999999955 is a deficient number, since it is larger than the sum of its proper divisors (212371134021197).

999999999999955 is a wasteful number, since it uses less digits than its factorization.

999999999999955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061855670205.

The product of its digits is 63546645708225, while the sum is 127.

It can be divided in two parts, 99999999999995 and 5, that added together give a 14-th power (100000000000000 = 10¹⁴).

The spelling of 999999999999955 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-five".