55566689 has 8 divisors (see below), whose sum is σ = 58104960. Its totient is φ = 53139108.

The previous prime is 55566677. The next prime is 55566701. The reversal of 55566689 is 98666555.

It is an interprime number because it is at equal distance from previous prime (55566677) and next prime (55566701).

It is not a de Polignac number, because 55566689 - 2⁴ = 55566673 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55566629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9884 + ... + 14450.

It is an arithmetic number, because the mean of its divisors is an integer number (7263120).

Almost surely, 2^55566689 is an apocalyptic number.

It is an amenable number.

55566689 is a deficient number, since it is larger than the sum of its proper divisors (2538271).

55566689 is an frugal number, since it uses more digits than its factorization.

55566689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636 (or 4590 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 50.

The square root of 55566689 is about 7454.3067417433. The cubic root of 55566689 is about 381.5969017068.

The spelling of 55566689 in words is "fifty-five million, five hundred sixty-six thousand, six hundred eighty-nine".