685955180450 has 48 divisors (see below), whose sum is σ = 1294041379176. Its totient is φ = 270499008000.

The previous prime is 685955180441. The next prime is 685955180459. The reversal of 685955180450 is 54081559586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (685955180441) and next prime (685955180459).

It can be written as a sum of positive squares in 12 ways, for example, as 199213146889 + 486742033561 = 446333^2 + 697669^2 .

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (685955180459) 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, 885164 + ... + 1468136.

Almost surely, 2^685955180450 is an apocalyptic number.

685955180450 is a deficient number, since it is larger than the sum of its proper divisors (608086198726).

685955180450 is a wasteful number, since it uses less digits than its factorization.

685955180450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583319 (or 583314 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 56.

The spelling of 685955180450 in words is "six hundred eighty-five billion, nine hundred fifty-five million, one hundred eighty thousand, four hundred fifty".