78879588661 has 4 divisors (see below), whose sum is σ = 78887714400. Its totient is φ = 78871462924.

The previous prime is 78879588653. The next prime is 78879588673. The reversal of 78879588661 is 16688597887.

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 78879588661 - 2³ = 78879588653 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 (78879588611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4048291 + ... + 4067728.

It is an arithmetic number, because the mean of its divisors is an integer number (19721928600).

Almost surely, 2^78879588661 is an apocalyptic number.

It is an amenable number.

78879588661 is a deficient number, since it is larger than the sum of its proper divisors (8125739).

78879588661 is an equidigital number, since it uses as much as digits as its factorization.

78879588661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8125738.

The product of its digits is 325140480, while the sum is 73.

The spelling of 78879588661 in words is "seventy-eight billion, eight hundred seventy-nine million, five hundred eighty-eight thousand, six hundred sixty-one".