664645005501001 has 16 divisors (see below), whose sum is σ = 759748882201344. Its totient is φ = 569579787123264.

The previous prime is 664645005500999. The next prime is 664645005501023. The reversal of 664645005501001 is 100105500546466.

It is a cyclic number.

It is not a de Polignac number, because 664645005501001 - 2¹ = 664645005500999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664645005502001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758485951 + ... + 759361723.

It is an arithmetic number, because the mean of its divisors is an integer number (47484305137584).

Almost surely, 2^{664645005501001} is an apocalyptic number.

It is an amenable number.

664645005501001 is a deficient number, since it is larger than the sum of its proper divisors (95103876700343).

664645005501001 is a wasteful number, since it uses less digits than its factorization.

664645005501001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897720.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 664645005501001 in words is "six hundred sixty-four trillion, six hundred forty-five billion, five million, five hundred one thousand, one".