55555509640 has 128 divisors (see below), whose sum is σ = 129484293120. Its totient is φ = 21440563200.

The previous prime is 55555509619. The next prime is 55555509673. The reversal of 55555509640 is 4690555555.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54412330 + ... + 54413350.

It is an arithmetic number, because the mean of its divisors is an integer number (1011596040).

Almost surely, 2^55555509640 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 55555509640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64742146560).

55555509640 is an abundant number, since it is smaller than the sum of its proper divisors (73928783480).

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

55555509640 is a wasteful number, since it uses less digits than its factorization.

55555509640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 3375000, while the sum is 49.

The spelling of 55555509640 in words is "fifty-five billion, five hundred fifty-five million, five hundred nine thousand, six hundred forty".