78220477073445 has 128 divisors (see below), whose sum is σ = 148455051264000. Its totient is φ = 35144627083776.

The previous prime is 78220477073407. The next prime is 78220477073471. The reversal of 78220477073445 is 54437077402287.

It is not a de Polignac number, because 78220477073445 - 2⁷ = 78220477073317 is a prime.

It is a super-2 number, since 2×78220477073445² (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 (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1641298057 + ... + 1641345713.

It is an arithmetic number, because the mean of its divisors is an integer number (1159805088000).

Almost surely, 2^{78220477073445} is an apocalyptic number.

It is an amenable number.

78220477073445 is a deficient number, since it is larger than the sum of its proper divisors (70234574190555).

78220477073445 is a wasteful number, since it uses less digits than its factorization.

78220477073445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53152 (or 53138 counting only the distinct ones).

The product of its (nonzero) digits is 73758720, while the sum is 60.

The spelling of 78220477073445 in words is "seventy-eight trillion, two hundred twenty billion, four hundred seventy-seven million, seventy-three thousand, four hundred forty-five".