55861668 has 36 divisors (see below), whose sum is σ = 142002588. Its totient is φ = 18515520.

The previous prime is 55861657. The next prime is 55861669. The reversal of 55861668 is 86616855.

55861668 is a `hidden beast` number, since 5 + 586 + 1 + 6 + 68 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6749604 + 49112064 = 2598^2 + 7008^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (55861669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2230 + ... + 10802.

Almost surely, 2^55861668 is an apocalyptic number.

It is an amenable number.

55861668 is an abundant number, since it is smaller than the sum of its proper divisors (86140920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55861668 is a wasteful number, since it uses less digits than its factorization.

55861668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764 (or 8759 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 55861668 is about 7474.0663630985. The cubic root of 55861668 is about 382.2709534772.

It can be divided in two parts, 558 and 61668, that added together give a palindrome (62226).

The spelling of 55861668 in words is "fifty-five million, eight hundred sixty-one thousand, six hundred sixty-eight".