55555018520 has 16 divisors (see below), whose sum is σ = 124998791760. Its totient is φ = 22222007392.

The previous prime is 55555018511. The next prime is 55555018543. The reversal of 55555018520 is 2581055555.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694437692 + ... + 694437771.

It is an arithmetic number, because the mean of its divisors is an integer number (7812424485).

Almost surely, 2^55555018520 is an apocalyptic number.

It is an amenable number.

55555018520 is an abundant number, since it is smaller than the sum of its proper divisors (69443773240).

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

55555018520 is a wasteful number, since it uses less digits than its factorization.

55555018520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388875474 (or 1388875470 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 41.

The spelling of 55555018520 in words is "fifty-five billion, five hundred fifty-five million, eighteen thousand, five hundred twenty".