664614313081 has 16 divisors (see below), whose sum is σ = 704619907200. Its totient is φ = 624710414080.

The previous prime is 664614313003. The next prime is 664614313123. The reversal of 664614313081 is 180313416466.

It is a cyclic number.

It is not a de Polignac number, because 664614313081 - 2⁷ = 664614312953 is a prime.

It is a super-2 number, since 2×664614313081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664614313981) 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, 54699195 + ... + 54711343.

It is an arithmetic number, because the mean of its divisors is an integer number (44038744200).

Almost surely, 2^664614313081 is an apocalyptic number.

It is an amenable number.

664614313081 is a deficient number, since it is larger than the sum of its proper divisors (40005594119).

664614313081 is a wasteful number, since it uses less digits than its factorization.

664614313081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16064.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 664614313081 in words is "six hundred sixty-four billion, six hundred fourteen million, three hundred thirteen thousand, eighty-one".