78218844368831 has 8 divisors (see below), whose sum is σ = 79243210965504. Its totient is φ = 77200860119040.

The previous prime is 78218844368827. The next prime is 78218844368851. The reversal of 78218844368831 is 13886344881287.

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

It is a cyclic number.

It is not a de Polignac number, because 78218844368831 - 2² = 78218844368827 is a prime.

It is a super-2 number, since 2×78218844368831² (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 (78218844368801) 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, 1595562050 + ... + 1595611071.

It is an arithmetic number, because the mean of its divisors is an integer number (9905401370688).

Almost surely, 2^{78218844368831} is an apocalyptic number.

78218844368831 is a deficient number, since it is larger than the sum of its proper divisors (1024366596673).

78218844368831 is a wasteful number, since it uses less digits than its factorization.

78218844368831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191173441.

The product of its digits is 396361728, while the sum is 71.

The spelling of 78218844368831 in words is "seventy-eight trillion, two hundred eighteen billion, eight hundred forty-four million, three hundred sixty-eight thousand, eight hundred thirty-one".