685996699601 has 2 divisors, whose sum is σ = 685996699602. Its totient is φ = 685996699600.

The previous prime is 685996699547. The next prime is 685996699621. The reversal of 685996699601 is 106996699586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 679173774400 + 6822925201 = 824120^2 + 82601^2 .

It is a cyclic number.

It is not a de Polignac number, because 685996699601 - 2²⁶ = 685929590737 is a prime.

It is not a weakly prime, because it can be changed into another prime (685996699621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342998349800 + 342998349801.

It is an arithmetic number, because the mean of its divisors is an integer number (342998349801).

Almost surely, 2^685996699601 is an apocalyptic number.

It is an amenable number.

685996699601 is a deficient number, since it is larger than the sum of its proper divisors (1).

685996699601 is an equidigital number, since it uses as much as digits as its factorization.

685996699601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340122240, while the sum is 74.

The spelling of 685996699601 in words is "six hundred eighty-five billion, nine hundred ninety-six million, six hundred ninety-nine thousand, six hundred one".