678420074581 has 2 divisors, whose sum is σ = 678420074582. Its totient is φ = 678420074580.

The previous prime is 678420074551. The next prime is 678420074597. The reversal of 678420074581 is 185470024876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669205802500 + 9214272081 = 818050^2 + 95991^2 .

It is a cyclic number.

It is not a de Polignac number, because 678420074581 - 2¹⁵ = 678420041813 is a prime.

It is a super-2 number, since 2×678420074581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678420074551) by changing a digit.

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 as a sum of consecutive naturals, namely, 339210037290 + 339210037291.

It is an arithmetic number, because the mean of its divisors is an integer number (339210037291).

Almost surely, 2^678420074581 is an apocalyptic number.

It is an amenable number.

678420074581 is a deficient number, since it is larger than the sum of its proper divisors (1).

678420074581 is an equidigital number, since it uses as much as digits as its factorization.

678420074581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 678420074581 in words is "six hundred seventy-eight billion, four hundred twenty million, seventy-four thousand, five hundred eighty-one".