78231515750569 has 2 divisors, whose sum is σ = 78231515750570. Its totient is φ = 78231515750568.

The previous prime is 78231515750527. The next prime is 78231515750603. The reversal of 78231515750569 is 96505751513287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53585503724944 + 24646012025625 = 7320212^2 + 4964475^2 .

It is a cyclic number.

It is not a de Polignac number, because 78231515750569 - 2⁹ = 78231515750057 is a prime.

It is a super-2 number, since 2×78231515750569² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78231515750569.

It is not a weakly prime, because it can be changed into another prime (78231515750519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39115757875284 + 39115757875285.

It is an arithmetic number, because the mean of its divisors is an integer number (39115757875285).

Almost surely, 2^{78231515750569} is an apocalyptic number.

It is an amenable number.

78231515750569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78231515750569 is an equidigital number, since it uses as much as digits as its factorization.

78231515750569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380000, while the sum is 64.

The spelling of 78231515750569 in words is "seventy-eight trillion, two hundred thirty-one billion, five hundred fifteen million, seven hundred fifty thousand, five hundred sixty-nine".