65398375657 has 2 divisors, whose sum is σ = 65398375658. Its totient is φ = 65398375656.

The previous prime is 65398375643. The next prime is 65398375681. The reversal of 65398375657 is 75657389356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37644148441 + 27754227216 = 194021^2 + 166596^2 .

It is a cyclic number.

It is not a de Polignac number, because 65398375657 - 2¹¹ = 65398373609 is a prime.

It is not a weakly prime, because it can be changed into another prime (65398975657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32699187828 + 32699187829.

It is an arithmetic number, because the mean of its divisors is an integer number (32699187829).

Almost surely, 2^65398375657 is an apocalyptic number.

It is an amenable number.

65398375657 is a deficient number, since it is larger than the sum of its proper divisors (1).

65398375657 is an equidigital number, since it uses as much as digits as its factorization.

65398375657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884000, while the sum is 64.

The spelling of 65398375657 in words is "sixty-five billion, three hundred ninety-eight million, three hundred seventy-five thousand, six hundred fifty-seven".