78311862719999 has 4 divisors (see below), whose sum is σ = 78312003887136. Its totient is φ = 78311721552864.

The previous prime is 78311862719989. The next prime is 78311862720037. The reversal of 78311862719999 is 99991726811387.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78311862719999 is a prime.

It is a super-2 number, since 2×78311862719999² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78311862719929) 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, 69748154 + ... + 70862039.

It is an arithmetic number, because the mean of its divisors is an integer number (19578000971784).

Almost surely, 2^{78311862719999} is an apocalyptic number.

78311862719999 is a deficient number, since it is larger than the sum of its proper divisors (141167137).

78311862719999 is a wasteful number, since it uses less digits than its factorization.

78311862719999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141167136.

The product of its digits is 740710656, while the sum is 80.

The spelling of 78311862719999 in words is "seventy-eight trillion, three hundred eleven billion, eight hundred sixty-two million, seven hundred nineteen thousand, nine hundred ninety-nine".