664801623371 has 2 divisors, whose sum is σ = 664801623372. Its totient is φ = 664801623370.

The previous prime is 664801623319. The next prime is 664801623373. The reversal of 664801623371 is 173326108466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664801623371 is a prime.

It is a super-2 number, since 2×664801623371² (a number of 24 digits) contains 22 as substring.

Together with 664801623373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664801623373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332400811685 + 332400811686.

It is an arithmetic number, because the mean of its divisors is an integer number (332400811686).

Almost surely, 2^664801623371 is an apocalyptic number.

664801623371 is a deficient number, since it is larger than the sum of its proper divisors (1).

664801623371 is an equidigital number, since it uses as much as digits as its factorization.

664801623371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 664801623371 in words is "six hundred sixty-four billion, eight hundred one million, six hundred twenty-three thousand, three hundred seventy-one".