55616905 has 16 divisors (see below), whose sum is σ = 67839120. Its totient is φ = 43767808.

The previous prime is 55616893. The next prime is 55616909. The reversal of 55616905 is 50961655.

55616905 = T₁₂₆ + T₁₂₇ + ... + T₆₉₄.

It can be written as a sum of positive squares in 8 ways, for example, as 6210064 + 49406841 = 2492^2 + 7029^2 .

It is a cyclic number.

It is not a de Polignac number, because 55616905 - 2⁷ = 55616777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55616909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97461 + ... + 98029.

It is an arithmetic number, because the mean of its divisors is an integer number (4239945).

Almost surely, 2^55616905 is an apocalyptic number.

It is an amenable number.

55616905 is a deficient number, since it is larger than the sum of its proper divisors (12222215).

55616905 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (55616904) it forms an eRAP, since the sums of their prime factors are consecutive (859 and 860).

55616905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 40500, while the sum is 37.

The square root of 55616905 is about 7457.6742353096. The cubic root of 55616905 is about 381.7118176807.

The spelling of 55616905 in words is "fifty-five million, six hundred sixteen thousand, nine hundred five".