5566431780 has 480 divisors, whose sum is σ = 21879432960. Its totient is φ = 1153336320.

The previous prime is 5566431749. The next prime is 5566431799. The reversal of 5566431780 is 871346655.

5566431780 is a `hidden beast` number, since 5 + 566 + 4 + 3 + 1 + 7 + 80 = 666.

It is a super-2 number, since 2×5566431780² = 61970325522787936800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 8992311 + ... + 8992929.

It is an arithmetic number, because the mean of its divisors is an integer number (45582152).

Almost surely, 2^5566431780 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 5566431780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10939716480).

5566431780 is an abundant number, since it is smaller than the sum of its proper divisors (16313001180).

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

5566431780 is a wasteful number, since it uses less digits than its factorization.

5566431780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 5566431780 is about 74608.5235077065. The cubic root of 5566431780 is about 1772.2526332085.

The spelling of 5566431780 in words is "five billion, five hundred sixty-six million, four hundred thirty-one thousand, seven hundred eighty".