684740615645 has 8 divisors (see below), whose sum is σ = 857414336256. Its totient is φ = 523975427536.

The previous prime is 684740615627. The next prime is 684740615659. The reversal of 684740615645 is 546516047486.

It is a happy number.

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 684740615645 - 2¹² = 684740611549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2977132997 + ... + 2977133226.

It is an arithmetic number, because the mean of its divisors is an integer number (107176792032).

Almost surely, 2^684740615645 is an apocalyptic number.

It is an amenable number.

684740615645 is a deficient number, since it is larger than the sum of its proper divisors (172673720611).

684740615645 is a wasteful number, since it uses less digits than its factorization.

684740615645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5954266251.

The product of its (nonzero) digits is 19353600, while the sum is 56.

The spelling of 684740615645 in words is "six hundred eighty-four billion, seven hundred forty million, six hundred fifteen thousand, six hundred forty-five".