685731155672 has 16 divisors (see below), whose sum is σ = 1286911614240. Its totient is φ = 342554725216.

The previous prime is 685731155663. The next prime is 685731155677. The reversal of 685731155672 is 276551137586.

685731155672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×685731155672⁴ (a number of 48 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685731155677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38847203 + ... + 38864850.

It is an arithmetic number, because the mean of its divisors is an integer number (80431975890).

Almost surely, 2^685731155672 is an apocalyptic number.

It is an amenable number.

685731155672 is a deficient number, since it is larger than the sum of its proper divisors (601180458568).

685731155672 is a wasteful number, since it uses less digits than its factorization.

685731155672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77713162 (or 77713158 counting only the distinct ones).

The product of its digits is 10584000, while the sum is 56.

The spelling of 685731155672 in words is "six hundred eighty-five billion, seven hundred thirty-one million, one hundred fifty-five thousand, six hundred seventy-two".