2661611400 has 480 divisors, whose sum is σ = 10802880000. Its totient is φ = 607098240.

The previous prime is 2661611383. The next prime is 2661611413. The reversal of 2661611400 is 41161662.

2661611400 is a `hidden beast` number, since 2 + 6 + 6 + 1 + 611 + 40 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5556361 + ... + 5556839.

It is an arithmetic number, because the mean of its divisors is an integer number (22506000).

Almost surely, 2^2661611400 is an apocalyptic number.

2661611400 is a gapful number since it is divisible by the number (20) 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 2661611400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5401440000).

2661611400 is an abundant number, since it is smaller than the sum of its proper divisors (8141268600).

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

2661611400 is a wasteful number, since it uses less digits than its factorization.

2661611400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2661611400 is about 51590.8073206846. The cubic root of 2661611400 is about 1385.8457128532.

The spelling of 2661611400 in words is "two billion, six hundred sixty-one million, six hundred eleven thousand, four hundred".