55345681 has 4 divisors (see below), whose sum is σ = 55624000. Its totient is φ = 55067364.

The previous prime is 55345669. The next prime is 55345723. The reversal of 55345681 is 18654355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55345681 - 2⁷ = 55345553 is a prime.

It is a super-2 number, since 2×55345681² = 6126288810707522, 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 55345681.

It is not an unprimeable number, because it can be changed into a prime (55345181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138861 + ... + 139258.

It is an arithmetic number, because the mean of its divisors is an integer number (13906000).

Almost surely, 2^55345681 is an apocalyptic number.

It is an amenable number.

55345681 is a deficient number, since it is larger than the sum of its proper divisors (278319).

55345681 is a wasteful number, since it uses less digits than its factorization.

55345681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278318.

The product of its digits is 72000, while the sum is 37.

The square root of 55345681 is about 7439.4677901043. The cubic root of 55345681 is about 381.0903150663.

The spelling of 55345681 in words is "fifty-five million, three hundred forty-five thousand, six hundred eighty-one".