78446017061 has 4 divisors (see below), whose sum is σ = 78449925132. Its totient is φ = 78442108992.

The previous prime is 78446017033. The next prime is 78446017073. The reversal of 78446017061 is 16071064487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28563028036 + 49882989025 = 169006^2 + 223345^2 .

It is a cyclic number.

It is not a de Polignac number, because 78446017061 - 2⁶ = 78446016997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78446019061) 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 3 ways as a sum of consecutive naturals, for example, 1923770 + ... + 1964123.

It is an arithmetic number, because the mean of its divisors is an integer number (19612481283).

Almost surely, 2^78446017061 is an apocalyptic number.

It is an amenable number.

78446017061 is a deficient number, since it is larger than the sum of its proper divisors (3908071).

78446017061 is a wasteful number, since it uses less digits than its factorization.

78446017061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908070.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 78446017061 in words is "seventy-eight billion, four hundred forty-six million, seventeen thousand, sixty-one".