685849237901 has 2 divisors, whose sum is σ = 685849237902. Its totient is φ = 685849237900.

The previous prime is 685849237873. The next prime is 685849237933. The reversal of 685849237901 is 109732948586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676415778025 + 9433459876 = 822445^2 + 97126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685849237901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685849237501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342924618950 + 342924618951.

It is an arithmetic number, because the mean of its divisors is an integer number (342924618951).

It is a 2-persistent number, because it is pandigital, and so is 2⋅685849237901 = 1371698475802, but 3⋅685849237901 = 2057547713703 is not.

Almost surely, 2^685849237901 is an apocalyptic number.

It is an amenable number.

685849237901 is a deficient number, since it is larger than the sum of its proper divisors (1).

685849237901 is an equidigital number, since it uses as much as digits as its factorization.

685849237901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 685849237901 in words is "six hundred eighty-five billion, eight hundred forty-nine million, two hundred thirty-seven thousand, nine hundred one".