664328515490 has 128 divisors (see below), whose sum is σ = 1344574183680. Its totient is φ = 234847641600.

The previous prime is 664328515489. The next prime is 664328515517. The reversal of 664328515490 is 94515823466.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 193510814 + ... + 193514246.

It is an arithmetic number, because the mean of its divisors is an integer number (10504485810).

Almost surely, 2^664328515490 is an apocalyptic number.

664328515490 is an abundant number, since it is smaller than the sum of its proper divisors (680245668190).

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

664328515490 is a wasteful number, since it uses less digits than its factorization.

664328515490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 664328515490 in words is "six hundred sixty-four billion, three hundred twenty-eight million, five hundred fifteen thousand, four hundred ninety".