55991481543 has 48 divisors (see below), whose sum is σ = 85096866816. Its totient is φ = 35408197440.

The previous prime is 55991481541. The next prime is 55991481563. The reversal of 55991481543 is 34518419955.

55991481543 is a `hidden beast` number, since 5 + 5 + 9 + 9 + 14 + 81 + 543 = 666.

It is not a de Polignac number, because 55991481543 - 2¹ = 55991481541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55991481543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55991481541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12731821 + ... + 12736217.

It is an arithmetic number, because the mean of its divisors is an integer number (1772851392).

Almost surely, 2^55991481543 is an apocalyptic number.

55991481543 is a deficient number, since it is larger than the sum of its proper divisors (29105385273).

55991481543 is a wasteful number, since it uses less digits than its factorization.

55991481543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924 (or 4921 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The spelling of 55991481543 in words is "fifty-five billion, nine hundred ninety-one million, four hundred eighty-one thousand, five hundred forty-three".