2661041808 has 200 divisors, whose sum is σ = 8264203200. Its totient is φ = 824069376.

The previous prime is 2661041791. The next prime is 2661041893. The reversal of 2661041808 is 8081401662.

2661041808 is a `hidden beast` number, since 26 + 610 + 4 + 18 + 0 + 8 = 666.

It is a super-2 number, since 2×2661041808² = 14162287007847817728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1304053 + ... + 1306091.

It is an arithmetic number, because the mean of its divisors is an integer number (41321016).

Almost surely, 2^2661041808 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 2661041808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4132101600).

2661041808 is an abundant number, since it is smaller than the sum of its proper divisors (5603161392).

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

2661041808 is a wasteful number, since it uses less digits than its factorization.

2661041808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 2661041808 is about 51585.2867395346. The cubic root of 2661041808 is about 1385.7468475634.

The spelling of 2661041808 in words is "two billion, six hundred sixty-one million, forty-one thousand, eight hundred eight".