99999999999947 has 16 divisors (see below), whose sum is σ = 101482735052832. Its totient is φ = 98526543436800.

The previous prime is 99999999999931. The next prime is 99999999999959. The reversal of 99999999999947 is 74999999999999.

It is a cyclic number.

It is not a de Polignac number, because 99999999999947 - 2⁴ = 99999999999931 is a prime.

It is a super-9 number, since 9×99999999999947⁹ (a number of 127 digits) contains 999999999 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999999999047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349981313 + ... + 350266925.

It is an arithmetic number, because the mean of its divisors is an integer number (6342670940802).

Almost surely, 2^{99999999999947} is an apocalyptic number.

99999999999947 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

99999999999947 is a deficient number, since it is larger than the sum of its proper divisors (1482735052885).

99999999999947 is a wasteful number, since it uses less digits than its factorization.

99999999999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301838.

The product of its digits is 7908027021468, while the sum is 119.

It can be divided in two parts, 9999999999994 and 7, that added together give a palindrome (10000000000001).

The spelling of 99999999999947 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".