664543351204 has 6 divisors (see below), whose sum is σ = 1162950864614. Its totient is φ = 332271675600.

The previous prime is 664543351183. The next prime is 664543351211. The reversal of 664543351204 is 402153345466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 623155517604 + 41387833600 = 789402^2 + 203440^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83067918897 + ... + 83067918904.

Almost surely, 2^664543351204 is an apocalyptic number.

It is an amenable number.

664543351204 is a deficient number, since it is larger than the sum of its proper divisors (498407513410).

664543351204 is a wasteful number, since it uses less digits than its factorization.

664543351204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166135837805 (or 166135837803 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 664543351204 in words is "six hundred sixty-four billion, five hundred forty-three million, three hundred fifty-one thousand, two hundred four".