16512421465 has 4 divisors (see below), whose sum is σ = 19814905764. Its totient is φ = 13209937168.

The previous prime is 16512421451. The next prime is 16512421501. The reversal of 16512421465 is 56412421561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2817804889 + 13694616576 = 53083^2 + 117024^2 .

It is a cyclic number.

It is not a de Polignac number, because 16512421465 - 2⁷ = 16512421337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1651242142 + ... + 1651242151.

It is an arithmetic number, because the mean of its divisors is an integer number (4953726441).

Almost surely, 2^16512421465 is an apocalyptic number.

It is an amenable number.

16512421465 is a deficient number, since it is larger than the sum of its proper divisors (3302484299).

16512421465 is an equidigital number, since it uses as much as digits as its factorization.

16512421465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302484298.

The product of its digits is 57600, while the sum is 37.

The spelling of 16512421465 in words is "sixteen billion, five hundred twelve million, four hundred twenty-one thousand, four hundred sixty-five".