16650616601 has 4 divisors (see below), whose sum is σ = 16650952500. Its totient is φ = 16650280704.

The previous prime is 16650616571. The next prime is 16650616603. The reversal of 16650616601 is 10661605661.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5308579600 + 11342037001 = 72860^2 + 106499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16650616601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16650616603) 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, 77276 + ... + 198173.

It is an arithmetic number, because the mean of its divisors is an integer number (4162738125).

Almost surely, 2^16650616601 is an apocalyptic number.

It is an amenable number.

16650616601 is a deficient number, since it is larger than the sum of its proper divisors (335899).

16650616601 is an equidigital number, since it uses as much as digits as its factorization.

16650616601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335898.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 16650616601 in words is "sixteen billion, six hundred fifty million, six hundred sixteen thousand, six hundred one".