65639701 has 2 divisors, whose sum is σ = 65639702. Its totient is φ = 65639700.

The previous prime is 65639687. The next prime is 65639767. The reversal of 65639701 is 10793656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44488900 + 21150801 = 6670^2 + 4599^2 .

It is a cyclic number.

It is not a de Polignac number, because 65639701 - 2⁷ = 65639573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65639501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32819850 + 32819851.

It is an arithmetic number, because the mean of its divisors is an integer number (32819851).

Almost surely, 2^65639701 is an apocalyptic number.

It is an amenable number.

65639701 is a deficient number, since it is larger than the sum of its proper divisors (1).

65639701 is an equidigital number, since it uses as much as digits as its factorization.

65639701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 65639701 is about 8101.8331876187. The cubic root of 65639701 is about 403.3872786409.

The spelling of 65639701 in words is "sixty-five million, six hundred thirty-nine thousand, seven hundred one".