55405865 has 8 divisors (see below), whose sum is σ = 66550848. Its totient is φ = 44282160.

The previous prime is 55405849. The next prime is 55405871. The reversal of 55405865 is 56850455.

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

It is not a de Polignac number, because 55405865 - 2⁴ = 55405849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1124 + ... + 10586.

It is an arithmetic number, because the mean of its divisors is an integer number (8318856).

Almost surely, 2^55405865 is an apocalyptic number.

It is an amenable number.

55405865 is a deficient number, since it is larger than the sum of its proper divisors (11144983).

55405865 is a wasteful number, since it uses less digits than its factorization.

55405865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10639.

The product of its (nonzero) digits is 120000, while the sum is 38.

The square root of 55405865 is about 7443.5116040751. The cubic root of 55405865 is about 381.2284001021.

The spelling of 55405865 in words is "fifty-five million, four hundred five thousand, eight hundred sixty-five".