55999985 has 8 divisors (see below), whose sum is σ = 67291560. Its totient is φ = 44738944.

The previous prime is 55999969. The next prime is 55999987. The reversal of 55999985 is 58999955.

It can be written as a sum of positive squares in 4 ways, for example, as 1106704 + 54893281 = 1052^2 + 7409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55999985 - 2⁴ = 55999969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55999987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3380 + ... + 11109.

It is an arithmetic number, because the mean of its divisors is an integer number (8411445).

Almost surely, 2^55999985 is an apocalyptic number.

It is an amenable number.

55999985 is a deficient number, since it is larger than the sum of its proper divisors (11291575).

55999985 is a wasteful number, since it uses less digits than its factorization.

55999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15267.

The product of its digits is 6561000, while the sum is 59.

The square root of 55999985 is about 7483.3137713182. The cubic root of 55999985 is about 382.5862023950.

The spelling of 55999985 in words is "fifty-five million, nine hundred ninety-nine thousand, nine hundred eighty-five".