55591216678 has 4 divisors (see below), whose sum is σ = 83386825020. Its totient is φ = 27795608338.

The previous prime is 55591216669. The next prime is 55591216697. The reversal of 55591216678 is 87661219555.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13897804168 + ... + 13897804171.

It is an arithmetic number, because the mean of its divisors is an integer number (20846706255).

Almost surely, 2^55591216678 is an apocalyptic number.

55591216678 is a deficient number, since it is larger than the sum of its proper divisors (27795608342).

55591216678 is a wasteful number, since it uses less digits than its factorization.

55591216678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27795608341.

The product of its digits is 4536000, while the sum is 55.

The spelling of 55591216678 in words is "fifty-five billion, five hundred ninety-one million, two hundred sixteen thousand, six hundred seventy-eight".