664635447027 has 48 divisors (see below), whose sum is σ = 1003876892928. Its totient is φ = 422935064640.

The previous prime is 664635447013. The next prime is 664635447031. The reversal of 664635447027 is 720744536466.

664635447027 is a `hidden beast` number, since 6 + 6 + 4 + 6 + 3 + 544 + 70 + 27 = 666.

It is not a de Polignac number, because 664635447027 - 2¹² = 664635442931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664635447037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 334490928 + ... + 334492914.

It is an arithmetic number, because the mean of its divisors is an integer number (20914101936).

Almost surely, 2^664635447027 is an apocalyptic number.

664635447027 is a deficient number, since it is larger than the sum of its proper divisors (339241445901).

664635447027 is a wasteful number, since it uses less digits than its factorization.

664635447027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600 (or 4597 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 54.

The spelling of 664635447027 in words is "six hundred sixty-four billion, six hundred thirty-five million, four hundred forty-seven thousand, twenty-seven".