78536257057841 has 4 divisors (see below), whose sum is σ = 85675916790384. Its totient is φ = 71396597325300.

The previous prime is 78536257057831. The next prime is 78536257057877. The reversal of 78536257057841 is 14875075263587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78536257057841 - 2³⁸ = 78261379150897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78536257057801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3569829866255 + ... + 3569829866276.

It is an arithmetic number, because the mean of its divisors is an integer number (21418979197596).

Almost surely, 2^{78536257057841} is an apocalyptic number.

It is an amenable number.

78536257057841 is a deficient number, since it is larger than the sum of its proper divisors (7139659732543).

78536257057841 is a wasteful number, since it uses less digits than its factorization.

78536257057841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7139659732542.

The product of its (nonzero) digits is 395136000, while the sum is 68.

The spelling of 78536257057841 in words is "seventy-eight trillion, five hundred thirty-six billion, two hundred fifty-seven million, fifty-seven thousand, eight hundred forty-one".