686228651057 has 8 divisors (see below), whose sum is σ = 710646137640. Its totient is φ = 661861459840.

The previous prime is 686228651021. The next prime is 686228651081. The reversal of 686228651057 is 750156822686.

It can be written as a sum of positive squares in 4 ways, for example, as 370754338816 + 315474312241 = 608896^2 + 561671^2 .

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

It is not a de Polignac number, because 686228651057 - 2⁶ = 686228650993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686228650993 and 686228651011.

It is not an unprimeable number, because it can be changed into a prime (686228651357) 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, 12546068 + ... + 12600645.

It is an arithmetic number, because the mean of its divisors is an integer number (88830767205).

Almost surely, 2^686228651057 is an apocalyptic number.

It is an amenable number.

686228651057 is a deficient number, since it is larger than the sum of its proper divisors (24417486583).

686228651057 is a wasteful number, since it uses less digits than its factorization.

686228651057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25147683.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 686228651057 in words is "six hundred eighty-six billion, two hundred twenty-eight million, six hundred fifty-one thousand, fifty-seven".