55512005 has 4 divisors (see below), whose sum is σ = 66614412. Its totient is φ = 44409600.

The previous prime is 55512001. The next prime is 55512071. The reversal of 55512005 is 50021555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50021555 = 5 ⋅10004311.

It can be written as a sum of positive squares in 2 ways, for example, as 13118884 + 42393121 = 3622^2 + 6511^2 .

It is not a de Polignac number, because 55512005 - 2² = 55512001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55512001) 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, 5551196 + ... + 5551205.

It is an arithmetic number, because the mean of its divisors is an integer number (16653603).

Almost surely, 2^55512005 is an apocalyptic number.

It is an amenable number.

55512005 is a deficient number, since it is larger than the sum of its proper divisors (11102407).

55512005 is a wasteful number, since it uses less digits than its factorization.

55512005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102406.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 55512005 is about 7450.6378921539. The cubic root of 55512005 is about 381.4716822372.

The spelling of 55512005 in words is "fifty-five million, five hundred twelve thousand, five".