78547907557 has 16 divisors (see below), whose sum is σ = 89920351872. Its totient is φ = 67213396800.

The previous prime is 78547907521. The next prime is 78547907579. The reversal of 78547907557 is 75570974587.

It is a cyclic number.

It is not a de Polignac number, because 78547907557 - 2¹⁵ = 78547874789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78547902557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13477078 + ... + 13482904.

It is an arithmetic number, because the mean of its divisors is an integer number (5620021992).

Almost surely, 2^78547907557 is an apocalyptic number.

It is an amenable number.

78547907557 is a deficient number, since it is larger than the sum of its proper divisors (11372444315).

78547907557 is a wasteful number, since it uses less digits than its factorization.

78547907557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8748.

The product of its (nonzero) digits is 86436000, while the sum is 64.

The spelling of 78547907557 in words is "seventy-eight billion, five hundred forty-seven million, nine hundred seven thousand, five hundred fifty-seven".