685235403776 has 176 divisors, whose sum is σ = 1808267265792. Its totient is φ = 251269939200.

The previous prime is 685235403757. The next prime is 685235403781. The reversal of 685235403776 is 677304532586.

It is a tau number, because it is divible by the number of its divisors (176).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084811 + ... + 1596021.

Almost surely, 2^685235403776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685235403776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904133632896).

685235403776 is an abundant number, since it is smaller than the sum of its proper divisors (1123031862016).

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

685235403776 is a wasteful number, since it uses less digits than its factorization.

685235403776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511266 (or 511248 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 56.

The spelling of 685235403776 in words is "six hundred eighty-five billion, two hundred thirty-five million, four hundred three thousand, seven hundred seventy-six".