64905130927657 has 2 divisors, whose sum is σ = 64905130927658. Its totient is φ = 64905130927656.

The previous prime is 64905130927643. The next prime is 64905130927661. The reversal of 64905130927657 is 75672903150946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39483578691216 + 25421552236441 = 6283596^2 + 5041979^2 .

It is a cyclic number.

It is not a de Polignac number, because 64905130927657 - 2⁷ = 64905130927529 is a prime.

It is not a weakly prime, because it can be changed into another prime (64905130927627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32452565463828 + 32452565463829.

It is an arithmetic number, because the mean of its divisors is an integer number (32452565463829).

Almost surely, 2^{64905130927657} is an apocalyptic number.

It is an amenable number.

64905130927657 is a deficient number, since it is larger than the sum of its proper divisors (1).

64905130927657 is an equidigital number, since it uses as much as digits as its factorization.

64905130927657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 85730400, while the sum is 64.

The spelling of 64905130927657 in words is "sixty-four trillion, nine hundred five billion, one hundred thirty million, nine hundred twenty-seven thousand, six hundred fifty-seven".