685634883523 has 2 divisors, whose sum is σ = 685634883524. Its totient is φ = 685634883522.

The previous prime is 685634883473. The next prime is 685634883559. The reversal of 685634883523 is 325388436586.

685634883523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685634883523 is a prime.

It is not a weakly prime, because it can be changed into another prime (685634883023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342817441761 + 342817441762.

It is an arithmetic number, because the mean of its divisors is an integer number (342817441762).

Almost surely, 2^685634883523 is an apocalyptic number.

685634883523 is a deficient number, since it is larger than the sum of its proper divisors (1).

685634883523 is an equidigital number, since it uses as much as digits as its factorization.

685634883523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99532800, while the sum is 61.

The spelling of 685634883523 in words is "six hundred eighty-five billion, six hundred thirty-four million, eight hundred eighty-three thousand, five hundred twenty-three".