16501621326505 has 8 divisors (see below), whose sum is σ = 22630794962112. Its totient is φ = 11315397481008.

The previous prime is 16501621326503. The next prime is 16501621326539. The reversal of 16501621326505 is 50562312610561.

It is a happy number.

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 16501621326505 - 2¹ = 16501621326503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16501621326503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235737447487 + ... + 235737447556.

It is an arithmetic number, because the mean of its divisors is an integer number (2828849370264).

Almost surely, 2^{16501621326505} is an apocalyptic number.

It is an amenable number.

16501621326505 is a deficient number, since it is larger than the sum of its proper divisors (6129173635607).

16501621326505 is an equidigital number, since it uses as much as digits as its factorization.

16501621326505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471474895055.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 16501621326505 in words is "sixteen trillion, five hundred one billion, six hundred twenty-one million, three hundred twenty-six thousand, five hundred five".