685503859950 has 1536 divisors, whose sum is σ = 2553436569600. Its totient is φ = 131301181440.

The previous prime is 685503859949. The next prime is 685503859967. The reversal of 685503859950 is 59958305586.

685503859950 is a `hidden beast` number, since 6 + 8 + 5 + 5 + 0 + 38 + 599 + 5 + 0 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 767 ways as a sum of consecutive naturals, for example, 8259082609 + ... + 8259082691.

It is an arithmetic number, because the mean of its divisors is an integer number (1662393600).

Almost surely, 2^685503859950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685503859950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276718284800).

685503859950 is an abundant number, since it is smaller than the sum of its proper divisors (1867932709650).

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

685503859950 is a wasteful number, since it uses less digits than its factorization.

685503859950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 58320000, while the sum is 63.

The spelling of 685503859950 in words is "six hundred eighty-five billion, five hundred three million, eight hundred fifty-nine thousand, nine hundred fifty".