65440327691 has 2 divisors, whose sum is σ = 65440327692. Its totient is φ = 65440327690.

The previous prime is 65440327657. The next prime is 65440327699. The reversal of 65440327691 is 19672304456.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65440327691 is a prime.

It is a super-2 number, since 2×65440327691² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65440327699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32720163845 + 32720163846.

It is an arithmetic number, because the mean of its divisors is an integer number (32720163846).

Almost surely, 2^65440327691 is an apocalyptic number.

65440327691 is a deficient number, since it is larger than the sum of its proper divisors (1).

65440327691 is an equidigital number, since it uses as much as digits as its factorization.

65440327691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 65440327691 in words is "sixty-five billion, four hundred forty million, three hundred twenty-seven thousand, six hundred ninety-one".