78757607861 has 4 divisors (see below), whose sum is σ = 78790276224. Its totient is φ = 78724939500.

The previous prime is 78757607843. The next prime is 78757607867. The reversal of 78757607861 is 16870675787.

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 78757607861 - 2³⁰ = 77683866037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78757607794 and 78757607803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78757607867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16330565 + ... + 16335386.

It is an arithmetic number, because the mean of its divisors is an integer number (19697569056).

Almost surely, 2^78757607861 is an apocalyptic number.

It is an amenable number.

78757607861 is a deficient number, since it is larger than the sum of its proper divisors (32668363).

78757607861 is a wasteful number, since it uses less digits than its factorization.

78757607861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32668362.

The product of its (nonzero) digits is 27659520, while the sum is 62.

The spelling of 78757607861 in words is "seventy-eight billion, seven hundred fifty-seven million, six hundred seven thousand, eight hundred sixty-one".