16000005999981 has 8 divisors (see below), whose sum is σ = 21374288247744. Its totient is φ = 10646197209440.

The previous prime is 16000005999979. The next prime is 16000006000063. The reversal of 16000005999981 is 18999950000061.

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 16000005999981 - 2¹ = 16000005999979 is a prime.

It is a super-2 number, since 2×16000005999981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16000005999781) 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 7 ways as a sum of consecutive naturals, for example, 5118362481 + ... + 5118365606.

It is an arithmetic number, because the mean of its divisors is an integer number (2671786030968).

Almost surely, 2^{16000005999981} is an apocalyptic number.

It is an amenable number.

16000005999981 is a deficient number, since it is larger than the sum of its proper divisors (5374282247763).

16000005999981 is a wasteful number, since it uses less digits than its factorization.

16000005999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236728611.

The product of its (nonzero) digits is 1574640, while the sum is 57.

The spelling of 16000005999981 in words is "sixteen trillion, five million, nine hundred ninety-nine thousand, nine hundred eighty-one".