69664477 has 2 divisors, whose sum is σ = 69664478. Its totient is φ = 69664476.

The previous prime is 69664457. The next prime is 69664489. The reversal of 69664477 is 77446696.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66928761 + 2735716 = 8181^2 + 1654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69664477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 69664477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69664417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34832238 + 34832239.

It is an arithmetic number, because the mean of its divisors is an integer number (34832239).

Almost surely, 2^69664477 is an apocalyptic number.

It is an amenable number.

69664477 is a deficient number, since it is larger than the sum of its proper divisors (1).

69664477 is an equidigital number, since it uses as much as digits as its factorization.

69664477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 49.

The square root of 69664477 is about 8346.5248457067. The cubic root of 69664477 is about 411.4690055873.

The spelling of 69664477 in words is "sixty-nine million, six hundred sixty-four thousand, four hundred seventy-seven".