999999999958 has 4 divisors (see below), whose sum is σ = 1499999999940. Its totient is φ = 499999999978.

The previous prime is 999999999937. The next prime is 999999999959. The reversal of 999999999958 is 859999999999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (103) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249999999988 + ... + 249999999991.

It is an arithmetic number, because the mean of its divisors is an integer number (374999999985).

Almost surely, 2^999999999958 is an apocalyptic number.

999999999958 is a deficient number, since it is larger than the sum of its proper divisors (499999999982).

999999999958 is a wasteful number, since it uses less digits than its factorization.

999999999958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499999999981.

The product of its digits is 139471376040, while the sum is 103.

The spelling of 999999999958 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-eight".