678996495799 has 2 divisors, whose sum is σ = 678996495800. Its totient is φ = 678996495798.

The previous prime is 678996495773. The next prime is 678996495803. The reversal of 678996495799 is 997594699876.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678996495799 is a prime.

It is a super-2 number, since 2×678996495799² (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 (678996495719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339498247899 + 339498247900.

It is an arithmetic number, because the mean of its divisors is an integer number (339498247900).

Almost surely, 2^678996495799 is an apocalyptic number.

678996495799 is a deficient number, since it is larger than the sum of its proper divisors (1).

678996495799 is an equidigital number, since it uses as much as digits as its factorization.

678996495799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16665989760, while the sum is 88.

The spelling of 678996495799 in words is "six hundred seventy-eight billion, nine hundred ninety-six million, four hundred ninety-five thousand, seven hundred ninety-nine".