3855561000 has 128 divisors (see below), whose sum is σ = 12093494400. Its totient is φ = 1022668800.

The previous prime is 3855560999. The next prime is 3855561089. The reversal of 3855561000 is 1655583.

3855561000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 575671 + ... + 582329.

It is an arithmetic number, because the mean of its divisors is an integer number (94480425).

Almost surely, 2^3855561000 is an apocalyptic number.

3855561000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3855561000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6046747200).

3855561000 is an abundant number, since it is smaller than the sum of its proper divisors (8237933400).

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

3855561000 is a wasteful number, since it uses less digits than its factorization.

3855561000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876 (or 6862 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 3855561000 is about 62093.1638749388. The cubic root of 3855561000 is about 1568.0594575625.

The spelling of 3855561000 in words is "three billion, eight hundred fifty-five million, five hundred sixty-one thousand".