684943661952 has 160 divisors (see below), whose sum is σ = 2223688995000. Its totient is φ = 207558650880.

The previous prime is 684943661873. The next prime is 684943661993. The reversal of 684943661952 is 259166349486.

684943661952 is a `hidden beast` number, since 6 + 8 + 4 + 9 + 4 + 3 + 6 + 619 + 5 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 684943661952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2888827 + ... + 3116922.

Almost surely, 2^684943661952 is an apocalyptic number.

It is an amenable number.

684943661952 is an abundant number, since it is smaller than the sum of its proper divisors (1538745333048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684943661952 is a wasteful number, since it uses less digits than its factorization.

684943661952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6005786 (or 6005765 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 63.

The spelling of 684943661952 in words is "six hundred eighty-four billion, nine hundred forty-three million, six hundred sixty-one thousand, nine hundred fifty-two".