684260021466 has 576 divisors, whose sum is σ = 1976371488000. Its totient is φ = 176087955456.

The previous prime is 684260021429. The next prime is 684260021509. The reversal of 684260021466 is 664120062486.

684260021466 is a `hidden beast` number, since 6 + 8 + 426 + 0 + 0 + 214 + 6 + 6 = 666.

684260021466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1960630260 + ... + 1960630608.

It is an arithmetic number, because the mean of its divisors is an integer number (3431200500).

Almost surely, 2^684260021466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684260021466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (988185744000).

684260021466 is an abundant number, since it is smaller than the sum of its proper divisors (1292111466534).

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

684260021466 is a wasteful number, since it uses less digits than its factorization.

684260021466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 684260021466 in words is "six hundred eighty-four billion, two hundred sixty million, twenty-one thousand, four hundred sixty-six".