65753981 has 2 divisors, whose sum is σ = 65753982. Its totient is φ = 65753980.

The previous prime is 65753957. The next prime is 65754019. The reversal of 65753981 is 18935756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62948356 + 2805625 = 7934^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 65753981 - 2⁶ = 65753917 is a prime.

It is a super-2 number, since 2×65753981² = 8647172034696722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65753951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32876990 + 32876991.

It is an arithmetic number, because the mean of its divisors is an integer number (32876991).

Almost surely, 2^65753981 is an apocalyptic number.

It is an amenable number.

65753981 is a deficient number, since it is larger than the sum of its proper divisors (1).

65753981 is an equidigital number, since it uses as much as digits as its factorization.

65753981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 65753981 is about 8108.8828453740. The cubic root of 65753981 is about 403.6212446208.

The spelling of 65753981 in words is "sixty-five million, seven hundred fifty-three thousand, nine hundred eighty-one".