78531208269013 has 2 divisors, whose sum is σ = 78531208269014. Its totient is φ = 78531208269012.

The previous prime is 78531208268957. The next prime is 78531208269047. The reversal of 78531208269013 is 31096280213587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41161681253169 + 37369527015844 = 6415737^2 + 6113062^2 .

It is a cyclic number.

It is not a de Polignac number, because 78531208269013 - 2⁹ = 78531208268501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78531208369013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39265604134506 + 39265604134507.

It is an arithmetic number, because the mean of its divisors is an integer number (39265604134507).

Almost surely, 2^{78531208269013} is an apocalyptic number.

It is an amenable number.

78531208269013 is a deficient number, since it is larger than the sum of its proper divisors (1).

78531208269013 is an equidigital number, since it uses as much as digits as its factorization.

78531208269013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 78531208269013 in words is "seventy-eight trillion, five hundred thirty-one billion, two hundred eight million, two hundred sixty-nine thousand, thirteen".