78195840668 has 24 divisors (see below), whose sum is σ = 149713208064. Its totient is φ = 35441126000.

The previous prime is 78195840577. The next prime is 78195840683. The reversal of 78195840668 is 86604859187.

It is a super-2 number, since 2×78195840668² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78195840668.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2545508 + ... + 2576043.

It is an arithmetic number, because the mean of its divisors is an integer number (6238050336).

Almost surely, 2^78195840668 is an apocalyptic number.

It is an amenable number.

78195840668 is a deficient number, since it is larger than the sum of its proper divisors (71517367396).

78195840668 is a wasteful number, since it uses less digits than its factorization.

78195840668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121913 (or 5121911 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 62.

The spelling of 78195840668 in words is "seventy-eight billion, one hundred ninety-five million, eight hundred forty thousand, six hundred sixty-eight".