685637226513 has 48 divisors (see below), whose sum is σ = 1015585792000. Its totient is φ = 445592327040.

The previous prime is 685637226473. The next prime is 685637226541. The reversal of 685637226513 is 315622736586.

685637226513 is a `hidden beast` number, since 6 + 8 + 5 + 6 + 372 + 265 + 1 + 3 = 666.

It is not a de Polignac number, because 685637226513 - 2¹⁰ = 685637225489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685637226513.

It is not an unprimeable number, because it can be changed into a prime (685637226013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74529288 + ... + 74538486.

Almost surely, 2^685637226513 is an apocalyptic number.

It is an amenable number.

685637226513 is a deficient number, since it is larger than the sum of its proper divisors (329948565487).

685637226513 is a wasteful number, since it uses less digits than its factorization.

685637226513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10462 (or 10459 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 685637226513 in words is "six hundred eighty-five billion, six hundred thirty-seven million, two hundred twenty-six thousand, five hundred thirteen".