78152027016509 has 2 divisors, whose sum is σ = 78152027016510. Its totient is φ = 78152027016508.

The previous prime is 78152027016499. The next prime is 78152027016521. The reversal of 78152027016509 is 90561072025187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73788014100025 + 4364012916484 = 8589995^2 + 2089022^2 .

It is an emirp because it is prime and its reverse (90561072025187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78152027016509 - 2²⁴ = 78152010239293 is a prime.

It is a super-2 number, since 2×78152027016509² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78152027016559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39076013508254 + 39076013508255.

It is an arithmetic number, because the mean of its divisors is an integer number (39076013508255).

Almost surely, 2^{78152027016509} is an apocalyptic number.

It is an amenable number.

78152027016509 is a deficient number, since it is larger than the sum of its proper divisors (1).

78152027016509 is an equidigital number, since it uses as much as digits as its factorization.

78152027016509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2116800, while the sum is 53.

The spelling of 78152027016509 in words is "seventy-eight trillion, one hundred fifty-two billion, twenty-seven million, sixteen thousand, five hundred nine".