555666440 has 128 divisors (see below), whose sum is σ = 1481760000. Its totient is φ = 183582720.

The previous prime is 555666409. The next prime is 555666467. The reversal of 555666440 is 44666555.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1113311 + ... + 1113809.

It is an arithmetic number, because the mean of its divisors is an integer number (11576250).

Almost surely, 2^555666440 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 555666440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740880000).

555666440 is an abundant number, since it is smaller than the sum of its proper divisors (926093560).

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

555666440 is a wasteful number, since it uses less digits than its factorization.

555666440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The square root of 555666440 is about 23572.5781364704. The cubic root of 555666440 is about 822.1253807163.

The spelling of 555666440 in words is "five hundred fifty-five million, six hundred sixty-six thousand, four hundred forty".