685537357757 has 32 divisors (see below), whose sum is σ = 821923564800. Its totient is φ = 559342361088.

The previous prime is 685537357741. The next prime is 685537357781. The reversal of 685537357757 is 757753735586.

It is not a de Polignac number, because 685537357757 - 2⁴ = 685537357741 is a prime.

It is a super-2 number, since 2×685537357757² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685537357457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43219094 + ... + 43234952.

It is an arithmetic number, because the mean of its divisors is an integer number (25685111400).

Almost surely, 2^685537357757 is an apocalyptic number.

It is an amenable number.

685537357757 is a deficient number, since it is larger than the sum of its proper divisors (136386207043).

685537357757 is a wasteful number, since it uses less digits than its factorization.

685537357757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18885.

The product of its digits is 648270000, while the sum is 68.

The spelling of 685537357757 in words is "six hundred eighty-five billion, five hundred thirty-seven million, three hundred fifty-seven thousand, seven hundred fifty-seven".