16615606651601 has 8 divisors (see below), whose sum is σ = 16845662927520. Its totient is φ = 16386261524512.

The previous prime is 16615606651597. The next prime is 16615606651603. The reversal of 16615606651601 is 10615660651661.

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 16615606651601 - 2² = 16615606651597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16615606651601.

It is not an unprimeable number, because it can be changed into a prime (16615606651603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177740156 + ... + 177833613.

It is an arithmetic number, because the mean of its divisors is an integer number (2105707865940).

Almost surely, 2^{16615606651601} is an apocalyptic number.

It is an amenable number.

16615606651601 is a deficient number, since it is larger than the sum of its proper divisors (230056275919).

16615606651601 is an equidigital number, since it uses as much as digits as its factorization.

16615606651601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355574415.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 16615606651601 in words is "sixteen trillion, six hundred fifteen billion, six hundred six million, six hundred fifty-one thousand, six hundred one".