685021671116021 has 8 divisors (see below), whose sum is σ = 686659358901120. Its totient is φ = 683385677785872.

The previous prime is 685021671116009. The next prime is 685021671116053. The reversal of 685021671116021 is 120611176120586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685021671116021 - 2¹⁴ = 685021671099637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685021611116021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422804225 + ... + 424421318.

It is an arithmetic number, because the mean of its divisors is an integer number (85832419862640).

Almost surely, 2^{685021671116021} is an apocalyptic number.

It is an amenable number.

685021671116021 is a deficient number, since it is larger than the sum of its proper divisors (1637687785099).

685021671116021 is a wasteful number, since it uses less digits than its factorization.

685021671116021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847227475.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 685021671116021 in words is "six hundred eighty-five trillion, twenty-one billion, six hundred seventy-one million, one hundred sixteen thousand, twenty-one".