55581869 has 8 divisors (see below), whose sum is σ = 66284160. Its totient is φ = 45570096.

The previous prime is 55581847. The next prime is 55581887. The reversal of 55581869 is 96818555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55581869 - 2²⁰ = 54533293 is a prime.

It is a super-2 number, since 2×55581869² = 6178688323066322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55581839) 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, 172454 + ... + 172775.

It is an arithmetic number, because the mean of its divisors is an integer number (8285520).

Almost surely, 2^55581869 is an apocalyptic number.

It is an amenable number.

55581869 is a deficient number, since it is larger than the sum of its proper divisors (10702291).

55581869 is a wasteful number, since it uses less digits than its factorization.

55581869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345259.

The product of its digits is 432000, while the sum is 47.

The square root of 55581869 is about 7455.3248755504. The cubic root of 55581869 is about 381.6316474250.

The spelling of 55581869 in words is "fifty-five million, five hundred eighty-one thousand, eight hundred sixty-nine".