16432455074521 has 4 divisors (see below), whose sum is σ = 16432473486132. Its totient is φ = 16432436662912.

The previous prime is 16432455074489. The next prime is 16432455074573. The reversal of 16432455074521 is 12547055423461.

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 3079898641296 + 13352556433225 = 1754964^2 + 3654115^2 .

It is a cyclic number.

It is not a de Polignac number, because 16432455074521 - 2⁵ = 16432455074489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16432455074221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7794976 + ... + 9676081.

It is an arithmetic number, because the mean of its divisors is an integer number (4108118371533).

Almost surely, 2^{16432455074521} is an apocalyptic number.

It is an amenable number.

16432455074521 is a deficient number, since it is larger than the sum of its proper divisors (18411611).

16432455074521 is an equidigital number, since it uses as much as digits as its factorization.

16432455074521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18411610.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 16432455074521 in words is "sixteen trillion, four hundred thirty-two billion, four hundred fifty-five million, seventy-four thousand, five hundred twenty-one".