55669709 has 2 divisors, whose sum is σ = 55669710. Its totient is φ = 55669708.

The previous prime is 55669699. The next prime is 55669723. The reversal of 55669709 is 90796655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 122500 = 7453^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55669709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55669739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27834854 + 27834855.

It is an arithmetic number, because the mean of its divisors is an integer number (27834855).

Almost surely, 2^55669709 is an apocalyptic number.

It is an amenable number.

55669709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55669709 is an equidigital number, since it uses as much as digits as its factorization.

55669709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 510300, while the sum is 47.

The square root of 55669709 is about 7461.2136412249. The cubic root of 55669709 is about 381.8325815345.

The spelling of 55669709 in words is "fifty-five million, six hundred sixty-nine thousand, seven hundred nine".