685431606154 has 8 divisors (see below), whose sum is σ = 1063600768260. Its totient is φ = 330898016736.

The previous prime is 685431606077. The next prime is 685431606157. The reversal of 685431606154 is 451606134586.

It can be written as a sum of positive squares in 2 ways, for example, as 651805949025 + 33625657129 = 807345^2 + 183373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 685431606098 and 685431606107.

It is not an unprimeable number, because it can be changed into a prime (685431606157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5908893099 + ... + 5908893214.

Almost surely, 2^685431606154 is an apocalyptic number.

685431606154 is a deficient number, since it is larger than the sum of its proper divisors (378169162106).

685431606154 is a wasteful number, since it uses less digits than its factorization.

685431606154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11817786344.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 685431606154 in words is "six hundred eighty-five billion, four hundred thirty-one million, six hundred six thousand, one hundred fifty-four".