684428708511 has 12 divisors (see below), whose sum is σ = 1015338685192. Its totient is φ = 443953756656.

The previous prime is 684428708497. The next prime is 684428708519. The reversal of 684428708511 is 115807824486.

684428708511 is a `hidden beast` number, since 6 + 8 + 4 + 42 + 87 + 0 + 8 + 511 = 666.

It is not a de Polignac number, because 684428708511 - 2¹¹ = 684428706463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684428708519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1027670401 + ... + 1027671066.

Almost surely, 2^684428708511 is an apocalyptic number.

684428708511 is a deficient number, since it is larger than the sum of its proper divisors (330909976681).

684428708511 is a wasteful number, since it uses less digits than its factorization.

684428708511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055341510 (or 2055341507 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 684428708511 in words is "six hundred eighty-four billion, four hundred twenty-eight million, seven hundred eight thousand, five hundred eleven".