55666799 has 4 divisors (see below), whose sum is σ = 56073264. Its totient is φ = 55260336.

The previous prime is 55666771. The next prime is 55666813. The reversal of 55666799 is 99766655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99766655 = 5 ⋅19953331.

It is a cyclic number.

It is not a de Polignac number, because 55666799 - 2⁸ = 55666543 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 55666799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666199) 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, 203027 + ... + 203300.

It is an arithmetic number, because the mean of its divisors is an integer number (14018316).

Almost surely, 2^55666799 is an apocalyptic number.

55666799 is a deficient number, since it is larger than the sum of its proper divisors (406465).

55666799 is a wasteful number, since it uses less digits than its factorization.

55666799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406464.

The product of its digits is 3061800, while the sum is 53.

The square root of 55666799 is about 7461.0186301872. The cubic root of 55666799 is about 381.8259282923.

It can be divided in two parts, 55666 and 799, that added together give a palindrome (56465).

The spelling of 55666799 in words is "fifty-five million, six hundred sixty-six thousand, seven hundred ninety-nine".