16142561075521 has 4 divisors (see below), whose sum is σ = 16992169553200. Its totient is φ = 15292952597844.

The previous prime is 16142561075507. The next prime is 16142561075573. The reversal of 16142561075521 is 12557016524161.

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.

It is a cyclic number.

It is not a de Polignac number, because 16142561075521 - 2⁷ = 16142561075393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16142561075591) 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, 424804238811 + ... + 424804238848.

It is an arithmetic number, because the mean of its divisors is an integer number (4248042388300).

Almost surely, 2^{16142561075521} is an apocalyptic number.

It is an amenable number.

16142561075521 is a deficient number, since it is larger than the sum of its proper divisors (849608477679).

16142561075521 is an equidigital number, since it uses as much as digits as its factorization.

16142561075521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849608477678.

The product of its (nonzero) digits is 504000, while the sum is 46.

Adding to 16142561075521 its reverse (12557016524161), we get a palindrome (28699577599682).

The spelling of 16142561075521 in words is "sixteen trillion, one hundred forty-two billion, five hundred sixty-one million, seventy-five thousand, five hundred twenty-one".