664622660641 has 4 divisors (see below), whose sum is σ = 665536860352. Its totient is φ = 663708460932.

The previous prime is 664622660623. The next prime is 664622660651. The reversal of 664622660641 is 146066226466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664622660641 - 2⁹ = 664622660129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664622660651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457098765 + ... + 457100218.

It is an arithmetic number, because the mean of its divisors is an integer number (166384215088).

Almost surely, 2^664622660641 is an apocalyptic number.

It is an amenable number.

664622660641 is a deficient number, since it is larger than the sum of its proper divisors (914199711).

664622660641 is an equidigital number, since it uses as much as digits as its factorization.

664622660641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914199710.

The product of its (nonzero) digits is 2985984, while the sum is 49.

The spelling of 664622660641 in words is "six hundred sixty-four billion, six hundred twenty-two million, six hundred sixty thousand, six hundred forty-one".