78618421772488 has 16 divisors (see below), whose sum is σ = 158748736271580. Its totient is φ = 36285425433408.

The previous prime is 78618421772477. The next prime is 78618421772491. The reversal of 78618421772488 is 88427712481687.

It can be written as a sum of positive squares in 2 ways, for example, as 77328421020964 + 1290000751524 = 8793658^2 + 1135782^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78618421772488.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377973181495 + ... + 377973181702.

Almost surely, 2^{78618421772488} is an apocalyptic number.

It is an amenable number.

78618421772488 is an abundant number, since it is smaller than the sum of its proper divisors (80130314499092).

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

78618421772488 is a wasteful number, since it uses less digits than its factorization.

78618421772488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755946363216 (or 755946363212 counting only the distinct ones).

The product of its digits is 539492352, while the sum is 73.

The spelling of 78618421772488 in words is "seventy-eight trillion, six hundred eighteen billion, four hundred twenty-one million, seven hundred seventy-two thousand, four hundred eighty-eight".