65640629 has 2 divisors, whose sum is σ = 65640630. Its totient is φ = 65640628.

The previous prime is 65640599. The next prime is 65640647. The reversal of 65640629 is 92604656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52171729 + 13468900 = 7223^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 65640629 - 2²⁴ = 48863413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65640592 and 65640601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65640829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820314 + 32820315.

It is an arithmetic number, because the mean of its divisors is an integer number (32820315).

Almost surely, 2^65640629 is an apocalyptic number.

It is an amenable number.

65640629 is a deficient number, since it is larger than the sum of its proper divisors (1).

65640629 is an equidigital number, since it uses as much as digits as its factorization.

65640629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 65640629 is about 8101.8904584054. The cubic root of 65640629 is about 403.3891796328.

The spelling of 65640629 in words is "sixty-five million, six hundred forty thousand, six hundred twenty-nine".