684881148145 has 4 divisors (see below), whose sum is σ = 821857377780. Its totient is φ = 547904918512.

The previous prime is 684881148079. The next prime is 684881148173. The reversal of 684881148145 is 541841188486.

It is a happy number.

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 149406987024 + 535474161121 = 386532^2 + 731761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684881148145 is a prime.

It is a super-3 number, since 3×684881148145³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 684881148145.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68488114810 + ... + 68488114819.

It is an arithmetic number, because the mean of its divisors is an integer number (205464344445).

Almost surely, 2^684881148145 is an apocalyptic number.

It is an amenable number.

684881148145 is a deficient number, since it is larger than the sum of its proper divisors (136976229635).

684881148145 is a wasteful number, since it uses less digits than its factorization.

684881148145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136976229634.

The product of its digits is 7864320, while the sum is 58.

The spelling of 684881148145 in words is "six hundred eighty-four billion, eight hundred eighty-one million, one hundred forty-eight thousand, one hundred forty-five".