3555161620 has 48 divisors (see below), whose sum is σ = 7799878800. Its totient is φ = 1359411200.

The previous prime is 3555161521. The next prime is 3555161683. The reversal of 3555161620 is 261615553.

It can be written as a sum of positive squares in 8 ways, for example, as 302968836 + 3252192784 = 17406^2 + 57028^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28236 + ... + 88924.

It is an arithmetic number, because the mean of its divisors is an integer number (162497475).

Almost surely, 2^3555161620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3555161620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3899939400).

3555161620 is an abundant number, since it is smaller than the sum of its proper divisors (4244717180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3555161620 is a wasteful number, since it uses less digits than its factorization.

3555161620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60828 (or 60826 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 3555161620 is about 59625.1760584403. The cubic root of 3555161620 is about 1526.2292867008.

The spelling of 3555161620 in words is "three billion, five hundred fifty-five million, one hundred sixty-one thousand, six hundred twenty".