685956457 has 2 divisors, whose sum is σ = 685956458. Its totient is φ = 685956456.

The previous prime is 685956451. The next prime is 685956463. The reversal of 685956457 is 754659586.

It is a balanced prime because it is at equal distance from previous prime (685956451) and next prime (685956463).

It can be written as a sum of positive squares in only one way, i.e., 646379776 + 39576681 = 25424^2 + 6291^2 .

It is a cyclic number.

It is not a de Polignac number, because 685956457 - 2⁷ = 685956329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685956398 and 685956407.

It is not a weakly prime, because it can be changed into another prime (685956451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342978228 + 342978229.

It is an arithmetic number, because the mean of its divisors is an integer number (342978229).

Almost surely, 2^685956457 is an apocalyptic number.

It is an amenable number.

685956457 is a deficient number, since it is larger than the sum of its proper divisors (1).

685956457 is an equidigital number, since it uses as much as digits as its factorization.

685956457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072000, while the sum is 55.

The square root of 685956457 is about 26190.7704544941. The cubic root of 685956457 is about 881.9260744152.

The spelling of 685956457 in words is "six hundred eighty-five million, nine hundred fifty-six thousand, four hundred fifty-seven".