55505405 has 4 divisors (see below), whose sum is σ = 66606492. Its totient is φ = 44404320.

The previous prime is 55505383. The next prime is 55505419. The reversal of 55505405 is 50450555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50450555 = 5 ⋅10090111.

It can be written as a sum of positive squares in 2 ways, for example, as 36747844 + 18757561 = 6062^2 + 4331^2 .

It is not a de Polignac number, because 55505405 - 2¹⁰ = 55504381 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, 5550536 + ... + 5550545.

It is an arithmetic number, because the mean of its divisors is an integer number (16651623).

Almost surely, 2^55505405 is an apocalyptic number.

It is an amenable number.

55505405 is a deficient number, since it is larger than the sum of its proper divisors (11101087).

55505405 is a wasteful number, since it uses less digits than its factorization.

55505405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101086.

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 55505405 is about 7450.1949638919. The cubic root of 55505405 is about 381.4565635081.

The spelling of 55505405 in words is "fifty-five million, five hundred five thousand, four hundred five".