78807533549 has 2 divisors, whose sum is σ = 78807533550. Its totient is φ = 78807533548.

The previous prime is 78807533533. The next prime is 78807533591. The reversal of 78807533549 is 94533570887.

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., 58956696100 + 19850837449 = 242810^2 + 140893^2 .

It is a cyclic number.

It is not a de Polignac number, because 78807533549 - 2⁴ = 78807533533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78807533599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39403766774 + 39403766775.

It is an arithmetic number, because the mean of its divisors is an integer number (39403766775).

Almost surely, 2^78807533549 is an apocalyptic number.

It is an amenable number.

78807533549 is a deficient number, since it is larger than the sum of its proper divisors (1).

78807533549 is an equidigital number, since it uses as much as digits as its factorization.

78807533549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25401600, while the sum is 59.

The spelling of 78807533549 in words is "seventy-eight billion, eight hundred seven million, five hundred thirty-three thousand, five hundred forty-nine".