55115605 has 4 divisors (see below), whose sum is σ = 66138732. Its totient is φ = 44092480.

The previous prime is 55115591. The next prime is 55115611. The reversal of 55115605 is 50651155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50651155 = 5 ⋅10130231.

It can be written as a sum of positive squares in 2 ways, for example, as 27311076 + 27804529 = 5226^2 + 5273^2 .

It is not a de Polignac number, because 55115605 - 2¹³ = 55107413 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, 5511556 + ... + 5511565.

It is an arithmetic number, because the mean of its divisors is an integer number (16534683).

Almost surely, 2^55115605 is an apocalyptic number.

It is an amenable number.

55115605 is a deficient number, since it is larger than the sum of its proper divisors (11023127).

55115605 is a wasteful number, since it uses less digits than its factorization.

55115605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11023126.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 55115605 is about 7423.9884832885. The cubic root of 55115605 is about 380.5615082885.

The spelling of 55115605 in words is "fifty-five million, one hundred fifteen thousand, six hundred five".