16425530521 has 4 divisors (see below), whose sum is σ = 16462608912. Its totient is φ = 16388452132.

The previous prime is 16425530507. The next prime is 16425530567. The reversal of 16425530521 is 12503552461.

16425530521 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12503552461 = 521 ⋅23999141.

It is a cyclic number.

It is not a de Polignac number, because 16425530521 - 2⁵ = 16425530489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16425530221) 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, 18538531 + ... + 18539416.

It is an arithmetic number, because the mean of its divisors is an integer number (4115652228).

Almost surely, 2^16425530521 is an apocalyptic number.

It is an amenable number.

16425530521 is a deficient number, since it is larger than the sum of its proper divisors (37078391).

16425530521 is an equidigital number, since it uses as much as digits as its factorization.

16425530521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37078390.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 16425530521 in words is "sixteen billion, four hundred twenty-five million, five hundred thirty thousand, five hundred twenty-one".