9999999999901 has 16 divisors (see below), whose sum is σ = 10042072443648. Its totient is φ = 9958017614400.

The previous prime is 9999999999863. The next prime is 9999999999971. The reversal of 9999999999901 is 1099999999999.

It is a cyclic number.

It is not a de Polignac number, because 9999999999901 - 2²⁷ = 9999865782173 is a prime.

It is a super-9 number, since 9×9999999999901⁹ (a number of 118 digits) contains 999999999 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999999999971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1150346511 + ... + 1150355203.

It is an arithmetic number, because the mean of its divisors is an integer number (627629527728).

Almost surely, 2^{9999999999901} is an apocalyptic number.

It is an amenable number.

9999999999901 is a deficient number, since it is larger than the sum of its proper divisors (42072443747).

9999999999901 is a wasteful number, since it uses less digits than its factorization.

9999999999901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13332.

The product of its (nonzero) digits is 31381059609, while the sum is 100.

Adding to 9999999999901 its sum of digits (100), we get a palindrome (10000000000001).

It can be divided in two parts, 999999999 and 9901, that multiplied together give a palindrome (9900999990099).

The spelling of 9999999999901 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred one".