678007164449 has 2 divisors, whose sum is σ = 678007164450. Its totient is φ = 678007164448.

The previous prime is 678007164413. The next prime is 678007164463. The reversal of 678007164449 is 944461700876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444046311424 + 233960853025 = 666368^2 + 483695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678007164449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678007164394 and 678007164403.

It is not a weakly prime, because it can be changed into another prime (678007164949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339003582224 + 339003582225.

It is an arithmetic number, because the mean of its divisors is an integer number (339003582225).

Almost surely, 2^678007164449 is an apocalyptic number.

It is an amenable number.

678007164449 is a deficient number, since it is larger than the sum of its proper divisors (1).

678007164449 is an equidigital number, since it uses as much as digits as its factorization.

678007164449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 678007164449 in words is "six hundred seventy-eight billion, seven million, one hundred sixty-four thousand, four hundred forty-nine".