664860852053 has 4 divisors (see below), whose sum is σ = 664871680608. Its totient is φ = 664850023500.

The previous prime is 664860851957. The next prime is 664860852067. The reversal of 664860852053 is 350258068466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 350258068466 = 2 ⋅175129034233.

It is a cyclic number.

It is not a de Polignac number, because 664860852053 - 2⁸ = 664860851797 is a prime.

It is a super-3 number, since 3×664860852053³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664860851986 and 664860852004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664860812053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5321651 + ... + 5445152.

It is an arithmetic number, because the mean of its divisors is an integer number (166217920152).

Almost surely, 2^664860852053 is an apocalyptic number.

It is an amenable number.

664860852053 is a deficient number, since it is larger than the sum of its proper divisors (10828555).

664860852053 is a wasteful number, since it uses less digits than its factorization.

664860852053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10828554.

The product of its (nonzero) digits is 8294400, while the sum is 53.

The spelling of 664860852053 in words is "six hundred sixty-four billion, eight hundred sixty million, eight hundred fifty-two thousand, fifty-three".