685816127651 has 2 divisors, whose sum is σ = 685816127652. Its totient is φ = 685816127650.

The previous prime is 685816127639. The next prime is 685816127663. The reversal of 685816127651 is 156721618586.

It is a balanced prime because it is at equal distance from previous prime (685816127639) and next prime (685816127663).

It is a cyclic number.

It is not a de Polignac number, because 685816127651 - 2⁶ = 685816127587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (685816127351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342908063825 + 342908063826.

It is an arithmetic number, because the mean of its divisors is an integer number (342908063826).

Almost surely, 2^685816127651 is an apocalyptic number.

685816127651 is a deficient number, since it is larger than the sum of its proper divisors (1).

685816127651 is an equidigital number, since it uses as much as digits as its factorization.

685816127651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 56.

The spelling of 685816127651 in words is "six hundred eighty-five billion, eight hundred sixteen million, one hundred twenty-seven thousand, six hundred fifty-one".