664213056402 has 64 divisors (see below), whose sum is σ = 1551456460800. Its totient is φ = 189496902672.

The previous prime is 664213056391. The next prime is 664213056421. The reversal of 664213056402 is 204650312466.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1169343 + ... + 1641885.

It is an arithmetic number, because the mean of its divisors is an integer number (24241507200).

Almost surely, 2^664213056402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664213056402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (775728230400).

664213056402 is an abundant number, since it is smaller than the sum of its proper divisors (887243404398).

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

664213056402 is a wasteful number, since it uses less digits than its factorization.

664213056402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473252 (or 473238 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

Adding to 664213056402 its reverse (204650312466), we get a palindrome (868863368868).

The spelling of 664213056402 in words is "six hundred sixty-four billion, two hundred thirteen million, fifty-six thousand, four hundred two".