55021705 has 4 divisors (see below), whose sum is σ = 66026052. Its totient is φ = 44017360.

The previous prime is 55021693. The next prime is 55021711. The reversal of 55021705 is 50712055.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18696976 + 36324729 = 4324^2 + 6027^2 .

It is a de Polignac number, because none of the positive numbers 2^k-55021705 is a prime.

It is a super-2 number, since 2×55021705² = 6054776042214050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55021705.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5502166 + ... + 5502175.

It is an arithmetic number, because the mean of its divisors is an integer number (16506513).

Almost surely, 2^55021705 is an apocalyptic number.

It is an amenable number.

55021705 is a deficient number, since it is larger than the sum of its proper divisors (11004347).

55021705 is a wasteful number, since it uses less digits than its factorization.

55021705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11004346.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 55021705 is about 7417.6616935528. The cubic root of 55021705 is about 380.3452656079.

The spelling of 55021705 in words is "fifty-five million, twenty-one thousand, seven hundred five".