664666450573 has 16 divisors (see below), whose sum is σ = 706086512640. Its totient is φ = 623903212800.

The previous prime is 664666450561. The next prime is 664666450577. The reversal of 664666450573 is 375054666466.

It is a happy number.

It is not a de Polignac number, because 664666450573 - 2⁵ = 664666450541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664666450577) 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, 1655313 + ... + 2017273.

It is an arithmetic number, because the mean of its divisors is an integer number (44130407040).

Almost surely, 2^664666450573 is an apocalyptic number.

It is an amenable number.

664666450573 is a deficient number, since it is larger than the sum of its proper divisors (41420062067).

664666450573 is a wasteful number, since it uses less digits than its factorization.

664666450573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362868.

The product of its (nonzero) digits is 65318400, while the sum is 58.

The spelling of 664666450573 in words is "six hundred sixty-four billion, six hundred sixty-six million, four hundred fifty thousand, five hundred seventy-three".