664551340456653 has 48 divisors (see below), whose sum is σ = 1064281436203440. Its totient is φ = 396928975905792.

The previous prime is 664551340456651. The next prime is 664551340456657. The reversal of 664551340456653 is 356654043155466.

664551340456653 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 5 + 13 + 4 + 0 + 4 + 566 + 53 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 494621043849 + 664056719412804 = 703293^2 + 25769298^2 .

It is not a de Polignac number, because 664551340456653 - 2¹ = 664551340456651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664551340456651) 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, 185896326 + ... + 189437447.

It is an arithmetic number, because the mean of its divisors is an integer number (22172529920905).

Almost surely, 2^{664551340456653} is an apocalyptic number.

It is an amenable number.

664551340456653 is a deficient number, since it is larger than the sum of its proper divisors (399730095746787).

664551340456653 is a wasteful number, since it uses less digits than its factorization.

664551340456653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375334238 (or 375334235 counting only the distinct ones).

The product of its (nonzero) digits is 466560000, while the sum is 63.

The spelling of 664551340456653 in words is "six hundred sixty-four trillion, five hundred fifty-one billion, three hundred forty million, four hundred fifty-six thousand, six hundred fifty-three".