78866302861 has 4 divisors (see below), whose sum is σ = 78879927424. Its totient is φ = 78852678300.

The previous prime is 78866302843. The next prime is 78866302891. The reversal of 78866302861 is 16820366887.

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 78866302861 - 2⁵ = 78866302829 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 (78866302831) 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, 6803595 + ... + 6815176.

It is an arithmetic number, because the mean of its divisors is an integer number (19719981856).

Almost surely, 2^78866302861 is an apocalyptic number.

It is an amenable number.

78866302861 is a deficient number, since it is larger than the sum of its proper divisors (13624563).

78866302861 is a wasteful number, since it uses less digits than its factorization.

78866302861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13624562.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 78866302861 in words is "seventy-eight billion, eight hundred sixty-six million, three hundred two thousand, eight hundred sixty-one".