685963783680 has 640 divisors, whose sum is σ = 2566726576128. Its totient is φ = 153052250112.

The previous prime is 685963783619. The next prime is 685963783699. The reversal of 685963783680 is 86387369586.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-3 number, since 3×685963783680³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 404220592 + ... + 404222288.

Almost surely, 2^685963783680 is an apocalyptic number.

685963783680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685963783680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283363288064).

685963783680 is an abundant number, since it is smaller than the sum of its proper divisors (1880762792448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685963783680 is a wasteful number, since it uses less digits than its factorization.

685963783680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 69.

The spelling of 685963783680 in words is "six hundred eighty-five billion, nine hundred sixty-three million, seven hundred eighty-three thousand, six hundred eighty".