16720541504747 has 4 divisors (see below), whose sum is σ = 16722662601240. Its totient is φ = 16718420408256.

The previous prime is 16720541504741. The next prime is 16720541504759. The reversal of 16720541504747 is 74740514502761.

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 16720541504747 - 2¹⁶ = 16720541439211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16720541504741) 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, 1060536422 + ... + 1060552187.

It is an arithmetic number, because the mean of its divisors is an integer number (4180665650310).

Almost surely, 2^{16720541504747} is an apocalyptic number.

16720541504747 is a deficient number, since it is larger than the sum of its proper divisors (2121096493).

16720541504747 is an equidigital number, since it uses as much as digits as its factorization.

16720541504747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121096492.

The product of its (nonzero) digits is 6585600, while the sum is 53.

The spelling of 16720541504747 in words is "sixteen trillion, seven hundred twenty billion, five hundred forty-one million, five hundred four thousand, seven hundred forty-seven".