685557403905 has 32 divisors (see below), whose sum is σ = 1197817049088. Its totient is φ = 332055979200.

The previous prime is 685557403889. The next prime is 685557403907. The reversal of 685557403905 is 509304755586.

It is not a de Polignac number, because 685557403905 - 2⁴ = 685557403889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685557403907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1932799 + ... + 2259828.

It is an arithmetic number, because the mean of its divisors is an integer number (37431782784).

Almost surely, 2^685557403905 is an apocalyptic number.

It is an amenable number.

685557403905 is a deficient number, since it is larger than the sum of its proper divisors (512259645183).

685557403905 is a wasteful number, since it uses less digits than its factorization.

685557403905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4193637.

The product of its (nonzero) digits is 22680000, while the sum is 57.

The spelling of 685557403905 in words is "six hundred eighty-five billion, five hundred fifty-seven million, four hundred three thousand, nine hundred five".