55519864020 has 120 divisors (see below), whose sum is σ = 174230495208. Its totient is φ = 14799974400.

The previous prime is 55519864019. The next prime is 55519864039. The reversal of 55519864020 is 2046891555.

55519864020 is a `hidden beast` number, since 5 + 55 + 198 + 6 + 402 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16273084356 + 39246779664 = 127566^2 + 198108^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6866380 + ... + 6874460.

Almost surely, 2^55519864020 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 55519864020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87115247604).

55519864020 is an abundant number, since it is smaller than the sum of its proper divisors (118710631188).

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

55519864020 is a wasteful number, since it uses less digits than its factorization.

55519864020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12343 (or 12332 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 55519864020 in words is "fifty-five billion, five hundred nineteen million, eight hundred sixty-four thousand, twenty".