685738442257 has 8 divisors (see below), whose sum is σ = 748137259872. Its totient is φ = 623349451200.

The previous prime is 685738442197. The next prime is 685738442261. The reversal of 685738442257 is 752244837586.

685738442257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685738442257 - 2²³ = 685730053649 is a prime.

It is a super-2 number, since 2×685738442257² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685738442195 and 685738442204.

It is not an unprimeable number, because it can be changed into a prime (685738442057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2310343 + ... + 2590204.

It is an arithmetic number, because the mean of its divisors is an integer number (93517157484).

Almost surely, 2^685738442257 is an apocalyptic number.

It is an amenable number.

685738442257 is a deficient number, since it is larger than the sum of its proper divisors (62398817615).

685738442257 is a wasteful number, since it uses less digits than its factorization.

685738442257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4913279.

The product of its digits is 90316800, while the sum is 61.

The spelling of 685738442257 in words is "six hundred eighty-five billion, seven hundred thirty-eight million, four hundred forty-two thousand, two hundred fifty-seven".