5555621456 has 80 divisors (see below), whose sum is σ = 13558715520. Its totient is φ = 2142167040.

The previous prime is 5555621443. The next prime is 5555621473. The reversal of 5555621456 is 6541265555.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96260 + ... + 142748.

It is an arithmetic number, because the mean of its divisors is an integer number (169483944).

Almost surely, 2^5555621456 is an apocalyptic number.

5555621456 is a gapful number since it is divisible by the number (56) 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 5555621456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6779357760).

5555621456 is an abundant number, since it is smaller than the sum of its proper divisors (8003094064).

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

5555621456 is a wasteful number, since it uses less digits than its factorization.

5555621456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46612 (or 46606 counting only the distinct ones).

The product of its digits is 900000, while the sum is 44.

The square root of 5555621456 is about 74536.0413223026. The cubic root of 5555621456 is about 1771.1046182439.

The spelling of 5555621456 in words is "five billion, five hundred fifty-five million, six hundred twenty-one thousand, four hundred fifty-six".