4555161621 has 6 divisors (see below), whose sum is σ = 6579677910. Its totient is φ = 3036774408.

The previous prime is 4555161601. The next prime is 4555161643. The reversal of 4555161621 is 1261615554.

4555161621 is a `hidden beast` number, since 45 + 551 + 6 + 1 + 62 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3101264721 + 1453896900 = 55689^2 + 38130^2 .

It is not a de Polignac number, because 4555161621 - 2¹⁴ = 4555145237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4555161601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253064526 + ... + 253064543.

It is an arithmetic number, because the mean of its divisors is an integer number (1096612985).

Almost surely, 2^4555161621 is an apocalyptic number.

It is an amenable number.

4555161621 is a deficient number, since it is larger than the sum of its proper divisors (2024516289).

4555161621 is a wasteful number, since it uses less digits than its factorization.

4555161621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506129075 (or 506129072 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 4555161621 is about 67491.9374518172. The cubic root of 4555161621 is about 1657.6821598424.

It can be divided in two parts, 4555 and 161621, that added together give a triangular number (166176 = T₅₇₆).

The spelling of 4555161621 in words is "four billion, five hundred fifty-five million, one hundred sixty-one thousand, six hundred twenty-one".