55664893 has 4 divisors (see below), whose sum is σ = 56715228. Its totient is φ = 54614560.

The previous prime is 55664831. The next prime is 55664897. The reversal of 55664893 is 39846655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39846655 = 5 ⋅7969331.

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 41512249 = 3762^2 + 6443^2 .

It is a cyclic number.

It is not a de Polignac number, because 55664893 - 2⁹ = 55664381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55664897) 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, 525088 + ... + 525193.

It is an arithmetic number, because the mean of its divisors is an integer number (14178807).

Almost surely, 2^55664893 is an apocalyptic number.

55664893 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

55664893 is a deficient number, since it is larger than the sum of its proper divisors (1050335).

55664893 is a wasteful number, since it uses less digits than its factorization.

55664893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050334.

The product of its digits is 777600, while the sum is 46.

The square root of 55664893 is about 7460.8908985456. The cubic root of 55664893 is about 381.8215704073.

The spelling of 55664893 in words is "fifty-five million, six hundred sixty-four thousand, eight hundred ninety-three".