685996699547 has 2 divisors, whose sum is σ = 685996699548. Its totient is φ = 685996699546.

The previous prime is 685996699529. The next prime is 685996699601. The reversal of 685996699547 is 745996699586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685996699547 - 2²⁶ = 685929590683 is a prime.

It is a super-3 number, since 3×685996699547³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (685996699847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342998349773 + 342998349774.

It is an arithmetic number, because the mean of its divisors is an integer number (342998349774).

Almost surely, 2^685996699547 is an apocalyptic number.

685996699547 is a deficient number, since it is larger than the sum of its proper divisors (1).

685996699547 is an equidigital number, since it uses as much as digits as its factorization.

685996699547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7936185600, while the sum is 83.

The spelling of 685996699547 in words is "six hundred eighty-five billion, nine hundred ninety-six million, six hundred ninety-nine thousand, five hundred forty-seven".