78220064886645 has 24 divisors (see below), whose sum is σ = 137563882712928. Its totient is φ = 37924879944160.

The previous prime is 78220064886637. The next prime is 78220064886683. The reversal of 78220064886645 is 54668846002287.

It is not a de Polignac number, because 78220064886645 - 2³ = 78220064886637 is a prime.

It is a super-2 number, since 2×78220064886645² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 21548225427 + ... + 21548229056.

It is an arithmetic number, because the mean of its divisors is an integer number (5731828446372).

Almost surely, 2^{78220064886645} is an apocalyptic number.

It is an amenable number.

78220064886645 is a deficient number, since it is larger than the sum of its proper divisors (59343817826283).

78220064886645 is a wasteful number, since it uses less digits than its factorization.

78220064886645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43096454513 (or 43096454502 counting only the distinct ones).

The product of its (nonzero) digits is 247726080, while the sum is 66.

The spelling of 78220064886645 in words is "seventy-eight trillion, two hundred twenty billion, sixty-four million, eight hundred eighty-six thousand, six hundred forty-five".