664126311209 has 32 divisors (see below), whose sum is σ = 690731435520. Its totient is φ = 638172057600.

The previous prime is 664126311203. The next prime is 664126311221. The reversal of 664126311209 is 902113621466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664126311209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664126311203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487968689 + ... + 487970049.

It is an arithmetic number, because the mean of its divisors is an integer number (21585357360).

Almost surely, 2^664126311209 is an apocalyptic number.

It is an amenable number.

664126311209 is a deficient number, since it is larger than the sum of its proper divisors (26605124311).

664126311209 is a wasteful number, since it uses less digits than its factorization.

664126311209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 664126311209 in words is "six hundred sixty-four billion, one hundred twenty-six million, three hundred eleven thousand, two hundred nine".