5661851580 has 288 divisors, whose sum is σ = 22344311808. Its totient is φ = 1125273600.

The previous prime is 5661851551. The next prime is 5661851609. The reversal of 5661851580 is 851581665.

5661851580 is a `hidden beast` number, since 5 + 6 + 6 + 18 + 51 + 580 = 666.

It is an interprime number because it is at equal distance from previous prime (5661851551) and next prime (5661851609).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 309900 + ... + 327660.

It is an arithmetic number, because the mean of its divisors is an integer number (77584416).

Almost surely, 2^5661851580 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 5661851580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11172155904).

5661851580 is an abundant number, since it is smaller than the sum of its proper divisors (16682460228).

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

5661851580 is a wasteful number, since it uses less digits than its factorization.

5661851580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17817 (or 17812 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The square root of 5661851580 is about 75245.2761307977. The cubic root of 5661851580 is about 1782.3219686766.

It can be divided in two parts, 566185 and 1580, that added together give a palindrome (567765).

The spelling of 5661851580 in words is "five billion, six hundred sixty-one million, eight hundred fifty-one thousand, five hundred eighty".