55591391472 has 80 divisors (see below), whose sum is σ = 145161438240. Its totient is φ = 18331462656.

The previous prime is 55591391447. The next prime is 55591391491. The reversal of 55591391472 is 27419319555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1709638 + ... + 1741850.

It is an arithmetic number, because the mean of its divisors is an integer number (1814517978).

Almost surely, 2^55591391472 is an apocalyptic number.

It is an amenable number.

55591391472 is an abundant number, since it is smaller than the sum of its proper divisors (89570046768).

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

55591391472 is a wasteful number, since it uses less digits than its factorization.

55591391472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32610 (or 32604 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 51.

The spelling of 55591391472 in words is "fifty-five billion, five hundred ninety-one million, three hundred ninety-one thousand, four hundred seventy-two".