678773279522 has 54 divisors (see below), whose sum is σ = 1131085588761. Its totient is φ = 305359367040.

The previous prime is 678773279521. The next prime is 678773279543. The reversal of 678773279522 is 225972377876.

It can be written as a sum of positive squares in 14 ways, for example, as 55635128641 + 623138150881 = 235871^2 + 789391^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=582569.

It is a super-2 number, since 2×678773279522² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678773279521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 621018008 + ... + 621019100.

Almost surely, 2^678773279522 is an apocalyptic number.

678773279522 is a deficient number, since it is larger than the sum of its proper divisors (452312309239).

678773279522 is an equidigital number, since it uses as much as digits as its factorization.

678773279522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 1149 counting only the distinct ones).

The product of its digits is 124467840, while the sum is 65.

The spelling of 678773279522 in words is "six hundred seventy-eight billion, seven hundred seventy-three million, two hundred seventy-nine thousand, five hundred twenty-two".