664765486857 has 24 divisors (see below), whose sum is σ = 1012247708160. Its totient is φ = 419231648160.

The previous prime is 664765486849. The next prime is 664765486871. The reversal of 664765486857 is 758684567466.

664765486857 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 65 + 486 + 85 + 7 = 666.

It is not a de Polignac number, because 664765486857 - 2³ = 664765486849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664765486807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2755369 + ... + 2986902.

It is an arithmetic number, because the mean of its divisors is an integer number (42176987840).

Almost surely, 2^664765486857 is an apocalyptic number.

It is an amenable number.

664765486857 is a deficient number, since it is larger than the sum of its proper divisors (347482221303).

664765486857 is a wasteful number, since it uses less digits than its factorization.

664765486857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5742973 (or 5742970 counting only the distinct ones).

The product of its digits is 1625702400, while the sum is 72.

The spelling of 664765486857 in words is "six hundred sixty-four billion, seven hundred sixty-five million, four hundred eighty-six thousand, eight hundred fifty-seven".