678735544433 has 2 divisors, whose sum is σ = 678735544434. Its totient is φ = 678735544432.

The previous prime is 678735544381. The next prime is 678735544483. The reversal of 678735544433 is 334445537876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674152660624 + 4582883809 = 821068^2 + 67697^2 .

It is a cyclic number.

It is not a de Polignac number, because 678735544433 - 2²⁶ = 678668435569 is a prime.

It is a super-4 number, since 4×678735544433⁴ (a number of 48 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (678735544483) by changing a digit.

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 as a sum of consecutive naturals, namely, 339367772216 + 339367772217.

It is an arithmetic number, because the mean of its divisors is an integer number (339367772217).

Almost surely, 2^678735544433 is an apocalyptic number.

It is an amenable number.

678735544433 is a deficient number, since it is larger than the sum of its proper divisors (1).

678735544433 is an equidigital number, since it uses as much as digits as its factorization.

678735544433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101606400, while the sum is 59.

The spelling of 678735544433 in words is "six hundred seventy-eight billion, seven hundred thirty-five million, five hundred forty-four thousand, four hundred thirty-three".