55518887 has 4 divisors (see below), whose sum is σ = 55655040. Its totient is φ = 55382736.

The previous prime is 55518863. The next prime is 55518899. The reversal of 55518887 is 78881555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78881555 = 5 ⋅15776311.

It is a cyclic number.

It is not a de Polignac number, because 55518887 - 2¹² = 55514791 is a prime.

It is a super-3 number, since 3×55518887³ (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 (55514887) 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, 67463 + ... + 68280.

It is an arithmetic number, because the mean of its divisors is an integer number (13913760).

Almost surely, 2^55518887 is an apocalyptic number.

55518887 is a deficient number, since it is larger than the sum of its proper divisors (136153).

55518887 is a wasteful number, since it uses less digits than its factorization.

55518887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136152.

The product of its digits is 448000, while the sum is 47.

The square root of 55518887 is about 7451.0997174914. The cubic root of 55518887 is about 381.4874456721.

The spelling of 55518887 in words is "fifty-five million, five hundred eighteen thousand, eight hundred eighty-seven".