55421443521198 has 72 divisors (see below), whose sum is σ = 121798843370568. Its totient is φ = 18213001413984.

The previous prime is 55421443521193. The next prime is 55421443521203. The reversal of 55421443521198 is 89112534412455.

55421443521198 is a `hidden beast` number, since 5 + 5 + 4 + 2 + 1 + 443 + 5 + 2 + 1 + 198 = 666.

It is an interprime number because it is at equal distance from previous prime (55421443521193) and next prime (55421443521203).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421443521193) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 75688465 + ... + 76417187.

It is an arithmetic number, because the mean of its divisors is an integer number (1691650602369).

Almost surely, 2^{55421443521198} is an apocalyptic number.

55421443521198 is an abundant number, since it is smaller than the sum of its proper divisors (66377399849370).

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

55421443521198 is a wasteful number, since it uses less digits than its factorization.

55421443521198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729566 (or 729484 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 54.

The spelling of 55421443521198 in words is "fifty-five trillion, four hundred twenty-one billion, four hundred forty-three million, five hundred twenty-one thousand, one hundred ninety-eight".