78535481487377 has 4 divisors (see below), whose sum is σ = 78537213640116. Its totient is φ = 78533749334640.

The previous prime is 78535481487367. The next prime is 78535481487443. The reversal of 78535481487377 is 77378418453587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8912995295296 + 69622486192081 = 2985464^2 + 8344009^2 .

It is a cyclic number.

It is not a de Polignac number, because 78535481487377 - 2⁴⁰ = 77435969859601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78535481487298 and 78535481487307.

It is not an unprimeable number, because it can be changed into a prime (78535481487317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866008358 + ... + 866099039.

It is an arithmetic number, because the mean of its divisors is an integer number (19634303410029).

Almost surely, 2^{78535481487377} is an apocalyptic number.

It is an amenable number.

78535481487377 is a deficient number, since it is larger than the sum of its proper divisors (1732152739).

78535481487377 is a wasteful number, since it uses less digits than its factorization.

78535481487377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732152738.

The product of its digits is 4425523200, while the sum is 77.

The spelling of 78535481487377 in words is "seventy-eight trillion, five hundred thirty-five billion, four hundred eighty-one million, four hundred eighty-seven thousand, three hundred seventy-seven".