685624047953 has 4 divisors (see below), whose sum is σ = 738364359348. Its totient is φ = 632883736560.

The previous prime is 685624047949. The next prime is 685624047961. The reversal of 685624047953 is 359740426586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403246590289 + 282377457664 = 635017^2 + 531392^2 .

It is a cyclic number.

It is not a de Polignac number, because 685624047953 - 2² = 685624047949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685624047892 and 685624047901.

It is not an unprimeable number, because it can be changed into a prime (685624047973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26370155678 + ... + 26370155703.

It is an arithmetic number, because the mean of its divisors is an integer number (184591089837).

Almost surely, 2^685624047953 is an apocalyptic number.

It is an amenable number.

685624047953 is a deficient number, since it is larger than the sum of its proper divisors (52740311395).

685624047953 is a wasteful number, since it uses less digits than its factorization.

685624047953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52740311394.

The product of its (nonzero) digits is 43545600, while the sum is 59.

The spelling of 685624047953 in words is "six hundred eighty-five billion, six hundred twenty-four million, forty-seven thousand, nine hundred fifty-three".