55071681 has 8 divisors (see below), whose sum is σ = 83918784. Its totient is φ = 31469520.

The previous prime is 55071649. The next prime is 55071689. The reversal of 55071681 is 18617055.

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

It is not a de Polignac number, because 55071681 - 2⁵ = 55071649 is a prime.

It is a super-2 number, since 2×55071681² = 6065780096331522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (55071689) 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 7 ways as a sum of consecutive naturals, for example, 1311210 + ... + 1311251.

It is an arithmetic number, because the mean of its divisors is an integer number (10489848).

Almost surely, 2^55071681 is an apocalyptic number.

It is an amenable number.

55071681 is a deficient number, since it is larger than the sum of its proper divisors (28847103).

55071681 is a wasteful number, since it uses less digits than its factorization.

55071681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622471.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 55071681 is about 7421.0296455411. The cubic root of 55071681 is about 380.4603861341.

The spelling of 55071681 in words is "fifty-five million, seventy-one thousand, six hundred eighty-one".