685048146781 has 8 divisors (see below), whose sum is σ = 713426679000. Its totient is φ = 656986693440.

The previous prime is 685048146779. The next prime is 685048146833. The reversal of 685048146781 is 187641840586.

It can be written as a sum of positive squares in 4 ways, for example, as 170003659225 + 515044487556 = 412315^2 + 717666^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 685048146781 - 2¹ = 685048146779 is a prime.

It is a super-2 number, since 2×685048146781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685048146581) 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 7 ways as a sum of consecutive naturals, for example, 79265310 + ... + 79273951.

It is an arithmetic number, because the mean of its divisors is an integer number (89178334875).

Almost surely, 2^685048146781 is an apocalyptic number.

It is an amenable number.

685048146781 is a deficient number, since it is larger than the sum of its proper divisors (28378532219).

685048146781 is a wasteful number, since it uses less digits than its factorization.

685048146781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158539439.

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 685048146781 in words is "six hundred eighty-five billion, forty-eight million, one hundred forty-six thousand, seven hundred eighty-one".