4661220161 has 4 divisors (see below), whose sum is σ = 5019775572. Its totient is φ = 4302664752.

The previous prime is 4661220149. The next prime is 4661220169. The reversal of 4661220161 is 1610221664.

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 2631177025 + 2030043136 = 51295^2 + 45056^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4661220161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4661220169) 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, 179277686 + ... + 179277711.

It is an arithmetic number, because the mean of its divisors is an integer number (1254943893).

Almost surely, 2^4661220161 is an apocalyptic number.

It is an amenable number.

4661220161 is a deficient number, since it is larger than the sum of its proper divisors (358555411).

4661220161 is a wasteful number, since it uses less digits than its factorization.

4661220161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358555410.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 4661220161 is about 68273.1291285232. The cubic root of 4661220161 is about 1670.4489405806.

The spelling of 4661220161 in words is "four billion, six hundred sixty-one million, two hundred twenty thousand, one hundred sixty-one".