65771799450989 has 2 divisors, whose sum is σ = 65771799450990. Its totient is φ = 65771799450988.

The previous prime is 65771799450971. The next prime is 65771799451003. The reversal of 65771799450989 is 98905499717756.

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., 54626437540900 + 11145361910089 = 7390970^2 + 3338467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65771799450989 is a prime.

It is a super-2 number, since 2×65771799450989² (a number of 28 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 65771799450989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65771799450919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32885899725494 + 32885899725495.

It is an arithmetic number, because the mean of its divisors is an integer number (32885899725495).

Almost surely, 2^{65771799450989} is an apocalyptic number.

It is an amenable number.

65771799450989 is a deficient number, since it is larger than the sum of its proper divisors (1).

65771799450989 is an equidigital number, since it uses as much as digits as its factorization.

65771799450989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10802030400, while the sum is 86.

The spelling of 65771799450989 in words is "sixty-five trillion, seven hundred seventy-one billion, seven hundred ninety-nine million, four hundred fifty thousand, nine hundred eighty-nine".