55665775 has 24 divisors (see below), whose sum is σ = 76387968. Its totient is φ = 39900000.

The previous prime is 55665749. The next prime is 55665829. The reversal of 55665775 is 57756655.

It is not a de Polignac number, because 55665775 - 2⁷ = 55665647 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 23 ways as a sum of consecutive naturals, for example, 18100 + ... + 20950.

It is an arithmetic number, because the mean of its divisors is an integer number (3182832).

Almost surely, 2^55665775 is an apocalyptic number.

55665775 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55665775 is a deficient number, since it is larger than the sum of its proper divisors (20722193).

55665775 is a wasteful number, since it uses less digits than its factorization.

55665775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943 (or 2938 counting only the distinct ones).

The product of its digits is 1102500, while the sum is 46.

The square root of 55665775 is about 7460.9500065340. The cubic root of 55665775 is about 381.8235870275.

The spelling of 55665775 in words is "fifty-five million, six hundred sixty-five thousand, seven hundred seventy-five".