678660953 has 2 divisors, whose sum is σ = 678660954. Its totient is φ = 678660952.

The previous prime is 678660911. The next prime is 678660979. The reversal of 678660953 is 359066876.

678660953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374925769 + 303735184 = 19363^2 + 17428^2 .

It is a cyclic number.

It is not a de Polignac number, because 678660953 - 2¹⁴ = 678644569 is a prime.

It is not a weakly prime, because it can be changed into another prime (678660053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339330476 + 339330477.

It is an arithmetic number, because the mean of its divisors is an integer number (339330477).

Almost surely, 2^678660953 is an apocalyptic number.

It is an amenable number.

678660953 is a deficient number, since it is larger than the sum of its proper divisors (1).

678660953 is an equidigital number, since it uses as much as digits as its factorization.

678660953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 678660953 is about 26051.1219144205. The cubic root of 678660953 is about 878.7883432174.

The spelling of 678660953 in words is "six hundred seventy-eight million, six hundred sixty thousand, nine hundred fifty-three".