78630021736818 has 16 divisors (see below), whose sum is σ = 157710645321600. Its totient is φ = 26134906937616.

The previous prime is 78630021736813. The next prime is 78630021736823. The reversal of 78630021736818 is 81863712003687.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78630021736813) and next prime (78630021736823).

It is not an unprimeable number, because it can be changed into a prime (78630021736813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18775074730 + ... + 18775078917.

It is an arithmetic number, because the mean of its divisors is an integer number (9856915332600).

Almost surely, 2^{78630021736818} is an apocalyptic number.

78630021736818 is an abundant number, since it is smaller than the sum of its proper divisors (79080623584782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78630021736818 is a wasteful number, since it uses less digits than its factorization.

78630021736818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37550154001.

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 78630021736818 in words is "seventy-eight trillion, six hundred thirty billion, twenty-one million, seven hundred thirty-six thousand, eight hundred eighteen".