55178485 has 4 divisors (see below), whose sum is σ = 66214188. Its totient is φ = 44142784.

The previous prime is 55178477. The next prime is 55178537. The reversal of 55178485 is 58487155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58487155 = 5 ⋅11697431.

It can be written as a sum of positive squares in 2 ways, for example, as 32729841 + 22448644 = 5721^2 + 4738^2 .

It is a cyclic number.

It is not a de Polignac number, because 55178485 - 2³ = 55178477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5517844 + ... + 5517853.

It is an arithmetic number, because the mean of its divisors is an integer number (16553547).

Almost surely, 2^55178485 is an apocalyptic number.

It is an amenable number.

55178485 is a deficient number, since it is larger than the sum of its proper divisors (11035703).

55178485 is a wasteful number, since it uses less digits than its factorization.

55178485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035702.

The product of its digits is 224000, while the sum is 43.

The square root of 55178485 is about 7428.2221964613. Note that the first 3 decimals coincide. The cubic root of 55178485 is about 380.7061776197.

The spelling of 55178485 in words is "fifty-five million, one hundred seventy-eight thousand, four hundred eighty-five".