55991481238 has 32 divisors (see below), whose sum is σ = 104731481088. Its totient is φ = 21810667200.

The previous prime is 55991481157. The next prime is 55991481251. The reversal of 55991481238 is 83218419955.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 839043 + ... + 903313.

It is an arithmetic number, because the mean of its divisors is an integer number (3272858784).

Almost surely, 2^55991481238 is an apocalyptic number.

55991481238 is a deficient number, since it is larger than the sum of its proper divisors (48739999850).

55991481238 is a wasteful number, since it uses less digits than its factorization.

55991481238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69948.

The product of its digits is 3110400, while the sum is 55.

The spelling of 55991481238 in words is "fifty-five billion, nine hundred ninety-one million, four hundred eighty-one thousand, two hundred thirty-eight".