55173451918 has 16 divisors (see below), whose sum is σ = 89186506416. Its totient is φ = 25447481280.

The previous prime is 55173451913. The next prime is 55173451933. The reversal of 55173451918 is 81915437155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55173451913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676903 + ... + 754018.

It is an arithmetic number, because the mean of its divisors is an integer number (5574156651).

Almost surely, 2^55173451918 is an apocalyptic number.

55173451918 is a deficient number, since it is larger than the sum of its proper divisors (34013054498).

55173451918 is a wasteful number, since it uses less digits than its factorization.

55173451918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432419.

The product of its digits is 756000, while the sum is 49.

The spelling of 55173451918 in words is "fifty-five billion, one hundred seventy-three million, four hundred fifty-one thousand, nine hundred eighteen".