16295490731521 has 4 divisors (see below), whose sum is σ = 16331148260932. Its totient is φ = 16259833202112.

The previous prime is 16295490731501. The next prime is 16295490731549. The reversal of 16295490731521 is 12513709459261.

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 9435617345025 + 6859873386496 = 3071745^2 + 2619136^2 .

It is a cyclic number.

It is not a de Polignac number, because 16295490731521 - 2¹⁹ = 16295490207233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16295490731501) 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, 17828764020 + ... + 17828764933.

It is an arithmetic number, because the mean of its divisors is an integer number (4082787065233).

Almost surely, 2^{16295490731521} is an apocalyptic number.

It is an amenable number.

16295490731521 is a deficient number, since it is larger than the sum of its proper divisors (35657529411).

16295490731521 is an equidigital number, since it uses as much as digits as its factorization.

16295490731521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35657529410.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 16295490731521 in words is "sixteen trillion, two hundred ninety-five billion, four hundred ninety million, seven hundred thirty-one thousand, five hundred twenty-one".