16661120260047 has 4 divisors (see below), whose sum is σ = 22214827013400. Its totient is φ = 11107413506696.

The previous prime is 16661120260007. The next prime is 16661120260049. The reversal of 16661120260047 is 74006202116661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16661120260047 - 2²² = 16661116065743 is a prime.

It is a super-2 number, since 2×16661120260047² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16661120259990 and 16661120260008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661120260049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776853376672 + ... + 2776853376677.

It is an arithmetic number, because the mean of its divisors is an integer number (5553706753350).

Almost surely, 2^{16661120260047} is an apocalyptic number.

16661120260047 is a deficient number, since it is larger than the sum of its proper divisors (5553706753353).

16661120260047 is an equidigital number, since it uses as much as digits as its factorization.

16661120260047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553706753352.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 16661120260047 in words is "sixteen trillion, six hundred sixty-one billion, one hundred twenty million, two hundred sixty thousand, forty-seven".