16520001943 has 4 divisors (see below), whose sum is σ = 16966488520. Its totient is φ = 16073515368.

The previous prime is 16520001937. The next prime is 16520001961. The reversal of 16520001943 is 34910002561.

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 16520001943 - 2²¹ = 16517904791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520001973) 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, 223243233 + ... + 223243306.

It is an arithmetic number, because the mean of its divisors is an integer number (4241622130).

Almost surely, 2^16520001943 is an apocalyptic number.

16520001943 is a deficient number, since it is larger than the sum of its proper divisors (446486577).

16520001943 is an equidigital number, since it uses as much as digits as its factorization.

16520001943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446486576.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 16520001943 in words is "sixteen billion, five hundred twenty million, one thousand, nine hundred forty-three".