16605451601 has 4 divisors (see below), whose sum is σ = 16649970612. Its totient is φ = 16560932592.

The previous prime is 16605451589. The next prime is 16605451613. The reversal of 16605451601 is 10615450661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (16605451589) and next prime (16605451613).

It can be written as a sum of positive squares in 2 ways, for example, as 4588030225 + 12017421376 = 67735^2 + 109624^2 .

It is a cyclic number.

It is not a de Polignac number, because 16605451601 - 2²² = 16601257297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16605451651) 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, 22258946 + ... + 22259691.

It is an arithmetic number, because the mean of its divisors is an integer number (4162492653).

Almost surely, 2^16605451601 is an apocalyptic number.

It is an amenable number.

16605451601 is a deficient number, since it is larger than the sum of its proper divisors (44519011).

16605451601 is an equidigital number, since it uses as much as digits as its factorization.

16605451601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44519010.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 16605451601 in words is "sixteen billion, six hundred five million, four hundred fifty-one thousand, six hundred one".