78645349871 has 8 divisors (see below), whose sum is σ = 86004699600. Its totient is φ = 71320962240.

The previous prime is 78645349819. The next prime is 78645349873. The reversal of 78645349871 is 17894354687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78645349871 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 (78645349873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8735816 + ... + 8744813.

It is an arithmetic number, because the mean of its divisors is an integer number (10750587450).

Almost surely, 2^78645349871 is an apocalyptic number.

78645349871 is a deficient number, since it is larger than the sum of its proper divisors (7359349729).

78645349871 is a wasteful number, since it uses less digits than its factorization.

78645349871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17481049.

The product of its digits is 40642560, while the sum is 62.

The spelling of 78645349871 in words is "seventy-eight billion, six hundred forty-five million, three hundred forty-nine thousand, eight hundred seventy-one".