5555651220 has 384 divisors, whose sum is σ = 20805120000. Its totient is φ = 1203890688.

The previous prime is 5555651209. The next prime is 5555651287. The reversal of 5555651220 is 221565555.

5555651220 is a `hidden beast` number, since 55 + 556 + 51 + 2 + 2 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6467151 + ... + 6468009.

It is an arithmetic number, because the mean of its divisors is an integer number (54180000).

Almost surely, 2^5555651220 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 5555651220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10402560000).

5555651220 is an abundant number, since it is smaller than the sum of its proper divisors (15249468780).

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

5555651220 is a wasteful number, since it uses less digits than its factorization.

5555651220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The square root of 5555651220 is about 74536.2409838328. The cubic root of 5555651220 is about 1771.1077811102.

The spelling of 5555651220 in words is "five billion, five hundred fifty-five million, six hundred fifty-one thousand, two hundred twenty".