664226810405 has 8 divisors (see below), whose sum is σ = 810138929784. Its totient is φ = 522670276800.

The previous prime is 664226810381. The next prime is 664226810413. The reversal of 664226810405 is 504018622466.

It can be written as a sum of positive squares in 4 ways, for example, as 355473316 + 663871337089 = 18854^2 + 814783^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-664226810405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088896106 + ... + 1088896715.

It is an arithmetic number, because the mean of its divisors is an integer number (101267366223).

Almost surely, 2^664226810405 is an apocalyptic number.

It is an amenable number.

664226810405 is a deficient number, since it is larger than the sum of its proper divisors (145912119379).

664226810405 is a wasteful number, since it uses less digits than its factorization.

664226810405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177792887.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 664226810405 in words is "six hundred sixty-four billion, two hundred twenty-six million, eight hundred ten thousand, four hundred five".