78218353167845 has 32 divisors (see below), whose sum is σ = 104150958468480. Its totient is φ = 55910886400000.

The previous prime is 78218353167841. The next prime is 78218353167893. The reversal of 78218353167845 is 54876135381287.

It is not a de Polignac number, because 78218353167845 - 2² = 78218353167841 is a prime.

It is a super-2 number, since 2×78218353167845² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218353167841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14115845 + ... + 18859845.

It is an arithmetic number, because the mean of its divisors is an integer number (3254717452140).

Almost surely, 2^{78218353167845} is an apocalyptic number.

It is an amenable number.

78218353167845 is a deficient number, since it is larger than the sum of its proper divisors (25932605300635).

78218353167845 is a wasteful number, since it uses less digits than its factorization.

78218353167845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4749157.

The product of its digits is 270950400, while the sum is 68.

The spelling of 78218353167845 in words is "seventy-eight trillion, two hundred eighteen billion, three hundred fifty-three million, one hundred sixty-seven thousand, eight hundred forty-five".