55332815 has 4 divisors (see below), whose sum is σ = 66399384. Its totient is φ = 44266248.

The previous prime is 55332811. The next prime is 55332817. The reversal of 55332815 is 51823355.

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 55332815 - 2² = 55332811 is a prime.

It is a super-3 number, since 3×55332815³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55332811) 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, 5533277 + ... + 5533286.

It is an arithmetic number, because the mean of its divisors is an integer number (16599846).

Almost surely, 2^55332815 is an apocalyptic number.

55332815 is a deficient number, since it is larger than the sum of its proper divisors (11066569).

55332815 is a wasteful number, since it uses less digits than its factorization.

55332815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11066568.

The product of its digits is 18000, while the sum is 32.

The square root of 55332815 is about 7438.6030274508. The cubic root of 55332815 is about 381.0607825723.

The spelling of 55332815 in words is "fifty-five million, three hundred thirty-two thousand, eight hundred fifteen".