78218684487143 has 64 divisors (see below), whose sum is σ = 87882695147520. Its totient is φ = 69280054272000.

The previous prime is 78218684487127. The next prime is 78218684487187. The reversal of 78218684487143 is 34178448681287.

It is a cyclic number.

It is not a de Polignac number, because 78218684487143 - 2⁴ = 78218684487127 is a prime.

It is a super-2 number, since 2×78218684487143² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218684487103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2209487243 + ... + 2209522643.

It is an arithmetic number, because the mean of its divisors is an integer number (1373167111680).

Almost surely, 2^{78218684487143} is an apocalyptic number.

78218684487143 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

78218684487143 is a deficient number, since it is larger than the sum of its proper divisors (9664010660377).

78218684487143 is a wasteful number, since it uses less digits than its factorization.

78218684487143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36328.

The product of its digits is 462422016, while the sum is 71.

The spelling of 78218684487143 in words is "seventy-eight trillion, two hundred eighteen billion, six hundred eighty-four million, four hundred eighty-seven thousand, one hundred forty-three".