69664421 has 2 divisors, whose sum is σ = 69664422. Its totient is φ = 69664420.

The previous prime is 69664417. The next prime is 69664433. The reversal of 69664421 is 12446696.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66601921 + 3062500 = 8161^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 69664421 - 2² = 69664417 is a prime.

It is a Chen prime.

It is equal to p_4099529 and since 69664421 and 4099529 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69664321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34832210 + 34832211.

It is an arithmetic number, because the mean of its divisors is an integer number (34832211).

Almost surely, 2^69664421 is an apocalyptic number.

It is an amenable number.

69664421 is a deficient number, since it is larger than the sum of its proper divisors (1).

69664421 is an equidigital number, since it uses as much as digits as its factorization.

69664421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 69664421 is about 8346.5214910165. The cubic root of 69664421 is about 411.4688953338.

The spelling of 69664421 in words is "sixty-nine million, six hundred sixty-four thousand, four hundred twenty-one".