16801666601 has 4 divisors (see below), whose sum is σ = 16803494400. Its totient is φ = 16799838804.

The previous prime is 16801666597. The next prime is 16801666603. The reversal of 16801666601 is 10666610861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16801666601 - 2² = 16801666597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16801666603) 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, 900041 + ... + 918518.

It is an arithmetic number, because the mean of its divisors is an integer number (4200873600).

Almost surely, 2^16801666601 is an apocalyptic number.

It is an amenable number.

16801666601 is a deficient number, since it is larger than the sum of its proper divisors (1827799).

16801666601 is an equidigital number, since it uses as much as digits as its factorization.

16801666601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827798.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 16801666601 in words is "sixteen billion, eight hundred one million, six hundred sixty-six thousand, six hundred one".