16520602723 has 4 divisors (see below), whose sum is σ = 16639456120. Its totient is φ = 16401749328.

The previous prime is 16520602697. The next prime is 16520602729. The reversal of 16520602723 is 32720602561.

16520602723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32720602561 = 1039 ⋅31492399.

It is a cyclic number.

It is not a de Polignac number, because 16520602723 - 2⁹ = 16520602211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520602729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59426490 + ... + 59426767.

It is an arithmetic number, because the mean of its divisors is an integer number (4159864030).

Almost surely, 2^16520602723 is an apocalyptic number.

16520602723 is a deficient number, since it is larger than the sum of its proper divisors (118853397).

16520602723 is a wasteful number, since it uses less digits than its factorization.

16520602723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118853396.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 16520602723 in words is "sixteen billion, five hundred twenty million, six hundred two thousand, seven hundred twenty-three".