685449519048 has 512 divisors, whose sum is σ = 2460450816000. Its totient is φ = 172219944960.

The previous prime is 685449518981. The next prime is 685449519059. The reversal of 685449519048 is 840915944586.

685449519048 is a `hidden beast` number, since 6 + 8 + 54 + 495 + 1 + 90 + 4 + 8 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23093065 + ... + 23122727.

It is an arithmetic number, because the mean of its divisors is an integer number (4805568000).

Almost surely, 2^685449519048 is an apocalyptic number.

685449519048 is a gapful number since it is divisible by the number (68) 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 685449519048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230225408000).

685449519048 is an abundant number, since it is smaller than the sum of its proper divisors (1775001296952).

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

685449519048 is a wasteful number, since it uses less digits than its factorization.

685449519048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29762 (or 29752 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 685449519048 in words is "six hundred eighty-five billion, four hundred forty-nine million, five hundred nineteen thousand, forty-eight".