64578715657 has 2 divisors, whose sum is σ = 64578715658. Its totient is φ = 64578715656.

The previous prime is 64578715631. The next prime is 64578715679. The reversal of 64578715657 is 75651787546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35207268496 + 29371447161 = 187636^2 + 171381^2 .

It is a cyclic number.

It is not a de Polignac number, because 64578715657 - 2³¹ = 62431232009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64578715595 and 64578715604.

It is not a weakly prime, because it can be changed into another prime (64578715457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32289357828 + 32289357829.

It is an arithmetic number, because the mean of its divisors is an integer number (32289357829).

Almost surely, 2^64578715657 is an apocalyptic number.

It is an amenable number.

64578715657 is a deficient number, since it is larger than the sum of its proper divisors (1).

64578715657 is an equidigital number, since it uses as much as digits as its factorization.

64578715657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392000, while the sum is 61.

The spelling of 64578715657 in words is "sixty-four billion, five hundred seventy-eight million, seven hundred fifteen thousand, six hundred fifty-seven".