55566889 has 4 divisors (see below), whose sum is σ = 63505024. Its totient is φ = 47628756.

The previous prime is 55566869. The next prime is 55566983. The reversal of 55566889 is 98866555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98866555 = 5 ⋅19773311.

It is not a de Polignac number, because 55566889 - 2⁵ = 55566857 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55566809) 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, 3969057 + ... + 3969070.

It is an arithmetic number, because the mean of its divisors is an integer number (15876256).

Almost surely, 2^55566889 is an apocalyptic number.

It is an amenable number.

55566889 is a deficient number, since it is larger than the sum of its proper divisors (7938135).

55566889 is an equidigital number, since it uses as much as digits as its factorization.

55566889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7938134.

The product of its digits is 2592000, while the sum is 52.

The square root of 55566889 is about 7454.3201567950. The cubic root of 55566889 is about 381.5973595308.

The spelling of 55566889 in words is "fifty-five million, five hundred sixty-six thousand, eight hundred eighty-nine".