664770432397 has 2 divisors, whose sum is σ = 664770432398. Its totient is φ = 664770432396.

The previous prime is 664770432379. The next prime is 664770432413. The reversal of 664770432397 is 793234077466.

Together with previous prime (664770432379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664712459401 + 57972996 = 815299^2 + 7614^2 .

It is a cyclic number.

It is not a de Polignac number, because 664770432397 - 2³¹ = 662622948749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664770430397) 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, 332385216198 + 332385216199.

It is an arithmetic number, because the mean of its divisors is an integer number (332385216199).

Almost surely, 2^664770432397 is an apocalyptic number.

It is an amenable number.

664770432397 is a deficient number, since it is larger than the sum of its proper divisors (1).

664770432397 is an equidigital number, since it uses as much as digits as its factorization.

664770432397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32006016, while the sum is 58.

The spelling of 664770432397 in words is "six hundred sixty-four billion, seven hundred seventy million, four hundred thirty-two thousand, three hundred ninety-seven".