55171980691200 has 2592 divisors, whose sum is σ = 217639220198400. Its totient is φ = 13301280276480.

The previous prime is 55171980691133. The next prime is 55171980691237. The reversal of 55171980691200 is 219608917155.

It is a happy number.

55171980691200 is a `hidden beast` number, since 5 + 517 + 19 + 8 + 0 + 6 + 91 + 20 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 199176825462 + ... + 199176825738.

Almost surely, 2^{55171980691200} is an apocalyptic number.

55171980691200 is a gapful number since it is divisible by the number (50) 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 55171980691200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108819610099200).

55171980691200 is an abundant number, since it is smaller than the sum of its proper divisors (162467239507200).

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

55171980691200 is a wasteful number, since it uses less digits than its factorization.

55171980691200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 54.

The spelling of 55171980691200 in words is "fifty-five trillion, one hundred seventy-one billion, nine hundred eighty million, six hundred ninety-one thousand, two hundred".