664321340490 has 32 divisors (see below), whose sum is σ = 1594535728896. Its totient is φ = 177134078400.

The previous prime is 664321340471. The next prime is 664321340503. The reversal of 664321340490 is 94043123466.

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, 845586 + ... + 1429565.

It is an arithmetic number, because the mean of its divisors is an integer number (49829241528).

Almost surely, 2^664321340490 is an apocalyptic number.

664321340490 is an abundant number, since it is smaller than the sum of its proper divisors (930214388406).

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

664321340490 is a wasteful number, since it uses less digits than its factorization.

664321340490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284894.

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 664321340490 in words is "six hundred sixty-four billion, three hundred twenty-one million, three hundred forty thousand, four hundred ninety".