55072171998400 has 168 divisors, whose sum is σ = 141420579646464. Its totient is φ = 21068589696000.

The previous prime is 55072171998367. The next prime is 55072171998509. The reversal of 55072171998400 is 489917127055.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326073975 + ... + 326242825.

Almost surely, 2^{55072171998400} is an apocalyptic number.

55072171998400 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 55072171998400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70710289823232).

55072171998400 is an abundant number, since it is smaller than the sum of its proper divisors (86348407648064).

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

55072171998400 is a wasteful number, since it uses less digits than its factorization.

55072171998400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177759 (or 177744 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 58.

The spelling of 55072171998400 in words is "fifty-five trillion, seventy-two billion, one hundred seventy-one million, nine hundred ninety-eight thousand, four hundred".