664580427161 has 24 divisors (see below), whose sum is σ = 812817195840. Its totient is φ = 530812025280.

The previous prime is 664580427139. The next prime is 664580427229. The reversal of 664580427161 is 161724085466.

It is not a de Polignac number, because 664580427161 - 2¹⁰ = 664580426137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664580427101) 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, 176546 + ... + 1166331.

It is an arithmetic number, because the mean of its divisors is an integer number (33867383160).

Almost surely, 2^664580427161 is an apocalyptic number.

664580427161 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

664580427161 is a deficient number, since it is larger than the sum of its proper divisors (148236768679).

664580427161 is a wasteful number, since it uses less digits than its factorization.

664580427161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343025 (or 1342964 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 664580427161 in words is "six hundred sixty-four billion, five hundred eighty million, four hundred twenty-seven thousand, one hundred sixty-one".