664840522055490 has 32 divisors (see below), whose sum is σ = 1740673366837056. Its totient is φ = 161173459892160.

The previous prime is 664840522055453. The next prime is 664840522055537. The reversal of 664840522055490 is 94550225048466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1007334123997 + ... + 1007334124656.

It is an arithmetic number, because the mean of its divisors is an integer number (54396042713658).

Almost surely, 2^{664840522055490} is an apocalyptic number.

664840522055490 is an abundant number, since it is smaller than the sum of its proper divisors (1075832844781566).

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

664840522055490 is a wasteful number, since it uses less digits than its factorization.

664840522055490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014668248674.

The product of its (nonzero) digits is 82944000, while the sum is 60.

The spelling of 664840522055490 in words is "six hundred sixty-four trillion, eight hundred forty billion, five hundred twenty-two million, fifty-five thousand, four hundred ninety".