55881681 has 8 divisors (see below), whose sum is σ = 74682720. Its totient is φ = 37167552.

The previous prime is 55881653. The next prime is 55881689. The reversal of 55881681 is 18618855.

It is a happy number.

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

It is not a de Polignac number, because 55881681 - 2⁹ = 55881169 is a prime.

It is a super-2 number, since 2×55881681² = 6245524542771522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55881689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20211 + ... + 22808.

It is an arithmetic number, because the mean of its divisors is an integer number (9335340).

Almost surely, 2^55881681 is an apocalyptic number.

It is an amenable number.

55881681 is a deficient number, since it is larger than the sum of its proper divisors (18801039).

55881681 is a wasteful number, since it uses less digits than its factorization.

55881681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43455.

The product of its digits is 76800, while the sum is 42.

The square root of 55881681 is about 7475.4050726365. The cubic root of 55881681 is about 382.3165988212.

The spelling of 55881681 in words is "fifty-five million, eight hundred eighty-one thousand, six hundred eighty-one".