679728364569949 has 2 divisors, whose sum is σ = 679728364569950. Its totient is φ = 679728364569948.

The previous prime is 679728364569901. The next prime is 679728364569973. The reversal of 679728364569949 is 949965463827976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 675948936964324 + 3779427605625 = 25999018^2 + 1944075^2 .

It is a cyclic number.

It is not a de Polignac number, because 679728364569949 - 2⁴⁵ = 644543992481117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679728364569649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339864182284974 + 339864182284975.

It is an arithmetic number, because the mean of its divisors is an integer number (339864182284975).

Almost surely, 2^{679728364569949} is an apocalyptic number.

It is an amenable number.

679728364569949 is a deficient number, since it is larger than the sum of its proper divisors (1).

679728364569949 is an equidigital number, since it uses as much as digits as its factorization.

679728364569949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 266655836160, while the sum is 94.

The spelling of 679728364569949 in words is "six hundred seventy-nine trillion, seven hundred twenty-eight billion, three hundred sixty-four million, five hundred sixty-nine thousand, nine hundred forty-nine".