685015667650 has 48 divisors (see below), whose sum is σ = 1286972878464. Its totient is φ = 271246135680.

The previous prime is 685015667647. The next prime is 685015667657. The reversal of 685015667650 is 56766510586.

It is a junction number, because it is equal to n+sod(n) for n = 685015667591 and 685015667600.

It is not an unprimeable number, because it can be changed into a prime (685015667657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14845014 + ... + 14891086.

It is an arithmetic number, because the mean of its divisors is an integer number (26811934968).

Almost surely, 2^685015667650 is an apocalyptic number.

685015667650 is a deficient number, since it is larger than the sum of its proper divisors (601957210814).

685015667650 is a wasteful number, since it uses less digits than its factorization.

685015667650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49075 (or 49070 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 55.

The spelling of 685015667650 in words is "six hundred eighty-five billion, fifteen million, six hundred sixty-seven thousand, six hundred fifty".