664465377443971 has 2 divisors, whose sum is σ = 664465377443972. Its totient is φ = 664465377443970.

The previous prime is 664465377443947. The next prime is 664465377443983. The reversal of 664465377443971 is 179344773564466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664465377443971 - 2¹³ = 664465377435779 is a prime.

It is a super-3 number, since 3×664465377443971³ (a number of 45 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (664465377443921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332232688721985 + 332232688721986.

It is an arithmetic number, because the mean of its divisors is an integer number (332232688721986).

Almost surely, 2^{664465377443971} is an apocalyptic number.

664465377443971 is a deficient number, since it is larger than the sum of its proper divisors (1).

664465377443971 is an equidigital number, since it uses as much as digits as its factorization.

664465377443971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7681443840, while the sum is 76.

The spelling of 664465377443971 in words is "six hundred sixty-four trillion, four hundred sixty-five billion, three hundred seventy-seven million, four hundred forty-three thousand, nine hundred seventy-one".