16001105111661 has 16 divisors (see below), whose sum is σ = 21832207974720. Its totient is φ = 10418731075200.

The previous prime is 16001105111633. The next prime is 16001105111683. The reversal of 16001105111661 is 16611150110061.

It is a de Polignac number, because none of the positive numbers 2^k-16001105111661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001105115661) 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, 1250490 + ... + 5793611.

It is an arithmetic number, because the mean of its divisors is an integer number (1364512998420).

Almost surely, 2^{16001105111661} is an apocalyptic number.

It is an amenable number.

16001105111661 is a deficient number, since it is larger than the sum of its proper divisors (5831102863059).

16001105111661 is a wasteful number, since it uses less digits than its factorization.

16001105111661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061756.

The product of its (nonzero) digits is 1080, while the sum is 30.

The spelling of 16001105111661 in words is "sixteen trillion, one billion, one hundred five million, one hundred eleven thousand, six hundred sixty-one".