55165555673 has 4 divisors (see below), whose sum is σ = 56206415268. Its totient is φ = 54124696080.

The previous prime is 55165555651. The next prime is 55165555691. The reversal of 55165555673 is 37655556155.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44942728009 + 10222827664 = 211997^2 + 101108^2 .

It is a cyclic number.

It is not a de Polignac number, because 55165555673 - 2¹⁶ = 55165490137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1040859541 = 55165555673 / (5 + 5 + 1 + 6 + 5 + 5 + 5 + 5 + 6 + 7 + 3).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55165555633) 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, 520429718 + ... + 520429823.

It is an arithmetic number, because the mean of its divisors is an integer number (14051603817).

Almost surely, 2^55165555673 is an apocalyptic number.

55165555673 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

55165555673 is a deficient number, since it is larger than the sum of its proper divisors (1040859595).

55165555673 is a wasteful number, since it uses less digits than its factorization.

55165555673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040859594.

The product of its digits is 11812500, while the sum is 53.

The spelling of 55165555673 in words is "fifty-five billion, one hundred sixty-five million, five hundred fifty-five thousand, six hundred seventy-three".