679745547919 has 2 divisors, whose sum is σ = 679745547920. Its totient is φ = 679745547918.

The previous prime is 679745547881. The next prime is 679745547931. The reversal of 679745547919 is 919745547976.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679745547919 is a prime.

It is a super-2 number, since 2×679745547919² (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 (679745547959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339872773959 + 339872773960.

It is an arithmetic number, because the mean of its divisors is an integer number (339872773960).

Almost surely, 2^679745547919 is an apocalyptic number.

679745547919 is a deficient number, since it is larger than the sum of its proper divisors (1).

679745547919 is an equidigital number, since it uses as much as digits as its factorization.

679745547919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600112800, while the sum is 73.

It can be divided in two parts, 679745 and 547919, that added together give a square (1227664 = 1108²).

The spelling of 679745547919 in words is "six hundred seventy-nine billion, seven hundred forty-five million, five hundred forty-seven thousand, nine hundred nineteen".