55005155 has 4 divisors (see below), whose sum is σ = 66006192. Its totient is φ = 44004120.

The previous prime is 55005151. The next prime is 55005157. The reversal of 55005155 is 55150055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55150055 = 5 ⋅11030011.

It is not a de Polignac number, because 55005155 - 2² = 55005151 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (55005151) 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, 5500511 + ... + 5500520.

It is an arithmetic number, because the mean of its divisors is an integer number (16501548).

Almost surely, 2^55005155 is an apocalyptic number.

55005155 is a deficient number, since it is larger than the sum of its proper divisors (11001037).

55005155 is a wasteful number, since it uses less digits than its factorization.

55005155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11001036.

The product of its (nonzero) digits is 3125, while the sum is 26.

The square root of 55005155 is about 7416.5460289814. The cubic root of 55005155 is about 380.3071270504.

The spelling of 55005155 in words is "fifty-five million, five thousand, one hundred fifty-five".