55173851687 has 4 divisors (see below), whose sum is σ = 55301865696. Its totient is φ = 55045837680.

The previous prime is 55173851669. The next prime is 55173851731. The reversal of 55173851687 is 78615837155.

55173851687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 55173851687 - 2¹⁸ = 55173589543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55173851617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64006358 + ... + 64007219.

It is an arithmetic number, because the mean of its divisors is an integer number (13825466424).

Almost surely, 2^55173851687 is an apocalyptic number.

55173851687 is a deficient number, since it is larger than the sum of its proper divisors (128014009).

55173851687 is a wasteful number, since it uses less digits than its factorization.

55173851687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128014008.

The product of its digits is 7056000, while the sum is 56.

The spelling of 55173851687 in words is "fifty-five billion, one hundred seventy-three million, eight hundred fifty-one thousand, six hundred eighty-seven".