65641534447 has 2 divisors, whose sum is σ = 65641534448. Its totient is φ = 65641534446.

The previous prime is 65641534429. The next prime is 65641534493. The reversal of 65641534447 is 74443514656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65641534447 - 2¹¹ = 65641532399 is a prime.

It is a super-2 number, since 2×65641534447² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65641534447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65641504447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820767223 + 32820767224.

It is an arithmetic number, because the mean of its divisors is an integer number (32820767224).

Almost surely, 2^65641534447 is an apocalyptic number.

65641534447 is a deficient number, since it is larger than the sum of its proper divisors (1).

65641534447 is an equidigital number, since it uses as much as digits as its factorization.

65641534447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 49.

The spelling of 65641534447 in words is "sixty-five billion, six hundred forty-one million, five hundred thirty-four thousand, four hundred forty-seven".