16258525821 has 20 divisors (see below), whose sum is σ = 25343405472. Its totient is φ = 10367754408.

The previous prime is 16258525813. The next prime is 16258525823. The reversal of 16258525821 is 12852585261.

16258525821 is a `hidden beast` number, since 1 + 62 + 5 + 8 + 5 + 2 + 582 + 1 = 666.

It is not a de Polignac number, because 16258525821 - 2³ = 16258525813 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16258525823) 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 19 ways as a sum of consecutive naturals, for example, 4361671 + ... + 4365396.

Almost surely, 2^16258525821 is an apocalyptic number.

It is an amenable number.

16258525821 is a deficient number, since it is larger than the sum of its proper divisors (9084879651).

16258525821 is an equidigital number, since it uses as much as digits as its factorization.

16258525821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8727102 (or 8727093 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The spelling of 16258525821 in words is "sixteen billion, two hundred fifty-eight million, five hundred twenty-five thousand, eight hundred twenty-one".