64387785639997 has 2 divisors, whose sum is σ = 64387785639998. Its totient is φ = 64387785639996.

The previous prime is 64387785639893. The next prime is 64387785640111. The reversal of 64387785639997 is 79993658778346.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63478650087801 + 909135552196 = 7967349^2 + 953486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64387785639997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64387785639497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32193892819998 + 32193892819999.

It is an arithmetic number, because the mean of its divisors is an integer number (32193892819999).

Almost surely, 2^{64387785639997} is an apocalyptic number.

It is an amenable number.

64387785639997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64387785639997 is an equidigital number, since it uses as much as digits as its factorization.

64387785639997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103699491840, while the sum is 91.

The spelling of 64387785639997 in words is "sixty-four trillion, three hundred eighty-seven billion, seven hundred eighty-five million, six hundred thirty-nine thousand, nine hundred ninety-seven".