664802027131 has 4 divisors (see below), whose sum is σ = 725238575064. Its totient is φ = 604365479200.

The previous prime is 664802027119. The next prime is 664802027147. The reversal of 664802027131 is 131720208466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664802027131 - 2¹⁹ = 664801502843 is a prime.

It is a super-2 number, since 2×664802027131² (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 (664802027101) 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, 30218273950 + ... + 30218273971.

It is an arithmetic number, because the mean of its divisors is an integer number (181309643766).

Almost surely, 2^664802027131 is an apocalyptic number.

664802027131 is a deficient number, since it is larger than the sum of its proper divisors (60436547933).

664802027131 is a wasteful number, since it uses less digits than its factorization.

664802027131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60436547932.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 664802027131 in words is "six hundred sixty-four billion, eight hundred two million, twenty-seven thousand, one hundred thirty-one".