78728759633 has 2 divisors, whose sum is σ = 78728759634. Its totient is φ = 78728759632.

The previous prime is 78728759587. The next prime is 78728759639. The reversal of 78728759633 is 33695782787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52676217169 + 26052542464 = 229513^2 + 161408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78728759633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78728759633.

It is not a weakly prime, because it can be changed into another prime (78728759639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39364379816 + 39364379817.

It is an arithmetic number, because the mean of its divisors is an integer number (39364379817).

Almost surely, 2^78728759633 is an apocalyptic number.

It is an amenable number.

78728759633 is a deficient number, since it is larger than the sum of its proper divisors (1).

78728759633 is an equidigital number, since it uses as much as digits as its factorization.

78728759633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 106686720, while the sum is 65.

The spelling of 78728759633 in words is "seventy-eight billion, seven hundred twenty-eight million, seven hundred fifty-nine thousand, six hundred thirty-three".