685521413280 has 144 divisors (see below), whose sum is σ = 2552009320224. Its totient is φ = 166187005440.

The previous prime is 685521413261. The next prime is 685521413293. The reversal of 685521413280 is 82314125586.

685521413280 is a `hidden beast` number, since 6 + 8 + 5 + 521 + 41 + 3 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21623094 + ... + 21654773.

It is an arithmetic number, because the mean of its divisors is an integer number (17722286946).

Almost surely, 2^685521413280 is an apocalyptic number.

685521413280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685521413280 is an abundant number, since it is smaller than the sum of its proper divisors (1866487906944).

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

685521413280 is a wasteful number, since it uses less digits than its factorization.

685521413280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43277899 (or 43277888 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 685521413280 in words is "six hundred eighty-five billion, five hundred twenty-one million, four hundred thirteen thousand, two hundred eighty".