65640880727 has 2 divisors, whose sum is σ = 65640880728. Its totient is φ = 65640880726.

The previous prime is 65640880717. The next prime is 65640880729. The reversal of 65640880727 is 72708804656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65640880727 is a prime.

Together with 65640880729, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65640880729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820440363 + 32820440364.

It is an arithmetic number, because the mean of its divisors is an integer number (32820440364).

Almost surely, 2^65640880727 is an apocalyptic number.

65640880727 is a deficient number, since it is larger than the sum of its proper divisors (1).

65640880727 is an equidigital number, since it uses as much as digits as its factorization.

65640880727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 65640880727 in words is "sixty-five billion, six hundred forty million, eight hundred eighty thousand, seven hundred twenty-seven".