78804652221 has 20 divisors (see below), whose sum is σ = 122838816672. Its totient is φ = 50252240808.

The previous prime is 78804652219. The next prime is 78804652231. The reversal of 78804652221 is 12225640887.

78804652221 is a `hidden beast` number, since 7 + 8 + 80 + 46 + 522 + 2 + 1 = 666.

It is not a de Polignac number, because 78804652221 - 2¹ = 78804652219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78804652211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21148071 + ... + 21151796.

Almost surely, 2^78804652221 is an apocalyptic number.

It is an amenable number.

78804652221 is a deficient number, since it is larger than the sum of its proper divisors (44034164451).

78804652221 is a wasteful number, since it uses less digits than its factorization.

78804652221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42299902 (or 42299893 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

It can be divided in two parts, 78804 and 652221, that added together give a square (731025 = 855²).

The spelling of 78804652221 in words is "seventy-eight billion, eight hundred four million, six hundred fifty-two thousand, two hundred twenty-one".