55666305565 has 32 divisors (see below), whose sum is σ = 77094614016. Its totient is φ = 38257401600.

The previous prime is 55666305553. The next prime is 55666305577. The reversal of 55666305565 is 56550366655.

It is an interprime number because it is at equal distance from previous prime (55666305553) and next prime (55666305577).

It is not a de Polignac number, because 55666305565 - 2²³ = 55657916957 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 31 ways as a sum of consecutive naturals, for example, 447861 + ... + 558490.

It is an arithmetic number, because the mean of its divisors is an integer number (2409206688).

Almost surely, 2^55666305565 is an apocalyptic number.

It is an amenable number.

55666305565 is a deficient number, since it is larger than the sum of its proper divisors (21428308451).

55666305565 is a wasteful number, since it uses less digits than its factorization.

55666305565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006429.

The product of its (nonzero) digits is 12150000, while the sum is 52.

The spelling of 55666305565 in words is "fifty-five billion, six hundred sixty-six million, three hundred five thousand, five hundred sixty-five".