16004542115661 has 16 divisors (see below), whose sum is σ = 24082069642560. Its totient is φ = 9365249304320.

The previous prime is 16004542115647. The next prime is 16004542115747. The reversal of 16004542115661 is 16651124540061.

16004542115661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16004542115661 - 2¹⁴ = 16004542099277 is a prime.

It is a super-2 number, since 2×16004542115661² (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 (16004542115641) 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, 8361828780 + ... + 8361830693.

It is an arithmetic number, because the mean of its divisors is an integer number (1505129352660).

Almost surely, 2^{16004542115661} is an apocalyptic number.

16004542115661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16004542115661 is a deficient number, since it is larger than the sum of its proper divisors (8077527526899).

16004542115661 is a wasteful number, since it uses less digits than its factorization.

16004542115661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16723659516.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 16004542115661 in words is "sixteen trillion, four billion, five hundred forty-two million, one hundred fifteen thousand, six hundred sixty-one".