664784840862 has 48 divisors (see below), whose sum is σ = 1469199513600. Its totient is φ = 217201246416.

The previous prime is 664784840861. The next prime is 664784840873. The reversal of 664784840862 is 268048487466.

664784840862 is a `hidden beast` number, since 6 + 6 + 4 + 78 + 484 + 0 + 86 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 664784840862.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664784840861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1562112 + ... + 1941587.

It is an arithmetic number, because the mean of its divisors is an integer number (30608323200).

Almost surely, 2^664784840862 is an apocalyptic number.

664784840862 is an abundant number, since it is smaller than the sum of its proper divisors (804414672738).

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

664784840862 is a wasteful number, since it uses less digits than its factorization.

664784840862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503917 (or 3503914 counting only the distinct ones).

The product of its (nonzero) digits is 99090432, while the sum is 63.

The spelling of 664784840862 in words is "six hundred sixty-four billion, seven hundred eighty-four million, eight hundred forty thousand, eight hundred sixty-two".