55509554640 has 160 divisors (see below), whose sum is σ = 182420574336. Its totient is φ = 13915095040.

The previous prime is 55509554627. The next prime is 55509554687. The reversal of 55509554640 is 4645590555.

It is a super-2 number, since 2×55509554640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 55509554640.

It is a congruent number.

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, 3586759 + ... + 3602201.

Almost surely, 2^55509554640 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 55509554640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91210287168).

55509554640 is an abundant number, since it is smaller than the sum of its proper divisors (126911019696).

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

55509554640 is a wasteful number, since it uses less digits than its factorization.

55509554640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16357 (or 16351 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 48.

The spelling of 55509554640 in words is "fifty-five billion, five hundred nine million, five hundred fifty-four thousand, six hundred forty".