16502412725321 has 8 divisors (see below), whose sum is σ = 17475230877480. Its totient is φ = 15529826572288.

The previous prime is 16502412725317. The next prime is 16502412725413. The reversal of 16502412725321 is 12352721420561.

It can be written as a sum of positive squares in 4 ways, for example, as 7917723684025 + 8584689041296 = 2813845^2 + 2929964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16502412725321 - 2² = 16502412725317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16502412725311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57853316 + ... + 58137861.

It is an arithmetic number, because the mean of its divisors is an integer number (2184403859685).

Almost surely, 2^{16502412725321} is an apocalyptic number.

It is an amenable number.

16502412725321 is a deficient number, since it is larger than the sum of its proper divisors (972818152159).

16502412725321 is a wasteful number, since it uses less digits than its factorization.

16502412725321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115999563.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 16502412725321 in words is "sixteen trillion, five hundred two billion, four hundred twelve million, seven hundred twenty-five thousand, three hundred twenty-one".