78659554091 has 4 divisors (see below), whose sum is σ = 78958640112. Its totient is φ = 78360468072.

The previous prime is 78659554067. The next prime is 78659554111. The reversal of 78659554091 is 19045595687.

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

It is a cyclic number.

It is not a de Polignac number, because 78659554091 - 2³⁰ = 77585812267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78659554091.

It is not an unprimeable number, because it can be changed into a prime (78659559091) 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, 149542616 + ... + 149543141.

It is an arithmetic number, because the mean of its divisors is an integer number (19739660028).

Almost surely, 2^78659554091 is an apocalyptic number.

78659554091 is a deficient number, since it is larger than the sum of its proper divisors (299086021).

78659554091 is a wasteful number, since it uses less digits than its factorization.

78659554091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299086020.

The product of its (nonzero) digits is 13608000, while the sum is 59.

The spelling of 78659554091 in words is "seventy-eight billion, six hundred fifty-nine million, five hundred fifty-four thousand, ninety-one".