685720366837 has 32 divisors (see below), whose sum is σ = 807673680000. Its totient is φ = 575539511040.

The previous prime is 685720366831. The next prime is 685720366871. The reversal of 685720366837 is 738663027586.

It is a cyclic number.

It is not a de Polignac number, because 685720366837 - 2²⁷ = 685586149109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685720366831) 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, 1442739 + ... + 1858207.

It is an arithmetic number, because the mean of its divisors is an integer number (25239802500).

Almost surely, 2^685720366837 is an apocalyptic number.

It is an amenable number.

685720366837 is a deficient number, since it is larger than the sum of its proper divisors (121953313163).

685720366837 is a wasteful number, since it uses less digits than its factorization.

685720366837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415701.

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 685720366837 in words is "six hundred eighty-five billion, seven hundred twenty million, three hundred sixty-six thousand, eight hundred thirty-seven".