78228621156512 has 24 divisors (see below), whose sum is σ = 154378423576692. Its totient is φ = 39021402470400.

The previous prime is 78228621156503. The next prime is 78228621156551. The reversal of 78228621156512 is 21565112682287.

It can be written as a sum of positive squares in 2 ways, for example, as 42560540536336 + 35668080620176 = 6523844^2 + 5972276^2 .

It is a super-2 number, since 2×78228621156512² (a number of 29 digits) contains 22 as substring.

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, 2903364689 + ... + 2903391632.

Almost surely, 2^{78228621156512} is an apocalyptic number.

It is an amenable number.

78228621156512 is a deficient number, since it is larger than the sum of its proper divisors (76149802420180).

78228621156512 is a wasteful number, since it uses less digits than its factorization.

78228621156512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806756752 (or 5806756744 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 56.

The spelling of 78228621156512 in words is "seventy-eight trillion, two hundred twenty-eight billion, six hundred twenty-one million, one hundred fifty-six thousand, five hundred twelve".