65641399 has 2 divisors, whose sum is σ = 65641400. Its totient is φ = 65641398.

The previous prime is 65641393. The next prime is 65641427. The reversal of 65641399 is 99314656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65641399 - 2³ = 65641391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65641391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820699 + 32820700.

It is an arithmetic number, because the mean of its divisors is an integer number (32820700).

Almost surely, 2^65641399 is an apocalyptic number.

65641399 is a deficient number, since it is larger than the sum of its proper divisors (1).

65641399 is an equidigital number, since it uses as much as digits as its factorization.

65641399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 43.

The square root of 65641399 is about 8101.9379780396. The cubic root of 65641399 is about 403.3907569509.

The spelling of 65641399 in words is "sixty-five million, six hundred forty-one thousand, three hundred ninety-nine".