16858072521 has 24 divisors (see below), whose sum is σ = 25380133376. Its totient is φ = 10770563520.

The previous prime is 16858072519. The next prime is 16858072529. The reversal of 16858072521 is 12527085861.

16858072521 is a `hidden beast` number, since 1 + 6 + 8 + 58 + 0 + 72 + 521 = 666.

It is not a de Polignac number, because 16858072521 - 2¹ = 16858072519 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16858072529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264580 + ... + 322053.

Almost surely, 2^16858072521 is an apocalyptic number.

It is an amenable number.

16858072521 is a deficient number, since it is larger than the sum of its proper divisors (8522060855).

16858072521 is a wasteful number, since it uses less digits than its factorization.

16858072521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586773 (or 586770 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 16858072521 in words is "sixteen billion, eight hundred fifty-eight million, seventy-two thousand, five hundred twenty-one".