55668913 has 2 divisors, whose sum is σ = 55668914. Its totient is φ = 55668912.

The previous prime is 55668889. The next prime is 55668923. The reversal of 55668913 is 31986655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45319824 + 10349089 = 6732^2 + 3217^2 .

It is a cyclic number.

It is not a de Polignac number, because 55668913 - 2⁵ = 55668881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55668913.

It is not a weakly prime, because it can be changed into another prime (55668923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27834456 + 27834457.

It is an arithmetic number, because the mean of its divisors is an integer number (27834457).

Almost surely, 2^55668913 is an apocalyptic number.

It is an amenable number.

55668913 is a deficient number, since it is larger than the sum of its proper divisors (1).

55668913 is an equidigital number, since it uses as much as digits as its factorization.

55668913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The square root of 55668913 is about 7461.1602985059. The cubic root of 55668913 is about 381.8307616329.

The spelling of 55668913 in words is "fifty-five million, six hundred sixty-eight thousand, nine hundred thirteen".