65037781 has 2 divisors, whose sum is σ = 65037782. Its totient is φ = 65037780.

The previous prime is 65037743. The next prime is 65037809. The reversal of 65037781 is 18773056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 23435281 = 6450^2 + 4841^2 .

It is a cyclic number.

It is not a de Polignac number, because 65037781 - 2⁷ = 65037653 is a prime.

It is a super-2 number, since 2×65037781² = 8459825914807922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65037781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65037481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32518890 + 32518891.

It is an arithmetic number, because the mean of its divisors is an integer number (32518891).

Almost surely, 2^65037781 is an apocalyptic number.

It is an amenable number.

65037781 is a deficient number, since it is larger than the sum of its proper divisors (1).

65037781 is an equidigital number, since it uses as much as digits as its factorization.

65037781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 65037781 is about 8064.6004860749. The cubic root of 65037781 is about 402.1504618166.

The spelling of 65037781 in words is "sixty-five million, thirty-seven thousand, seven hundred eighty-one".