664571042745706 has 32 divisors (see below), whose sum is σ = 1024112431515600. Its totient is φ = 323246964902400.

The previous prime is 664571042745697. The next prime is 664571042745707. The reversal of 664571042745706 is 607547240175466.

It can be written as a sum of positive squares in 8 ways, for example, as 283445340147225 + 381125702598481 = 16835835^2 + 19522441^2 .

It is a super-2 number, since 2×664571042745706² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664571042745707) 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, 2295619840 + ... + 2295909316.

Almost surely, 2^{664571042745706} is an apocalyptic number.

664571042745706 is a deficient number, since it is larger than the sum of its proper divisors (359541388769894).

664571042745706 is a wasteful number, since it uses less digits than its factorization.

664571042745706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370090.

The product of its (nonzero) digits is 237081600, while the sum is 64.

The spelling of 664571042745706 in words is "six hundred sixty-four trillion, five hundred seventy-one billion, forty-two million, seven hundred forty-five thousand, seven hundred six".