686467855121 has 8 divisors (see below), whose sum is σ = 710148426600. Its totient is φ = 662787901440.

The previous prime is 686467855081. The next prime is 686467855133. The reversal of 686467855121 is 121558764686.

686467855121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 231780622096 + 454687233025 = 481436^2 + 674305^2 .

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 686467855121 - 2¹⁴ = 686467838737 is a prime.

It is a super-2 number, since 2×686467855121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686467855141) 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, 4006865 + ... + 4174673.

It is an arithmetic number, because the mean of its divisors is an integer number (88768553325).

Almost surely, 2^686467855121 is an apocalyptic number.

It is an amenable number.

686467855121 is a deficient number, since it is larger than the sum of its proper divisors (23680571479).

686467855121 is a wasteful number, since it uses less digits than its factorization.

686467855121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308899.

The product of its digits is 19353600, while the sum is 59.

The spelling of 686467855121 in words is "six hundred eighty-six billion, four hundred sixty-seven million, eight hundred fifty-five thousand, one hundred twenty-one".