664187479 has 2 divisors, whose sum is σ = 664187480. Its totient is φ = 664187478.

The previous prime is 664187477. The next prime is 664187519. The reversal of 664187479 is 974781466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664187479 - 2¹ = 664187477 is a prime.

It is a super-2 number, since 2×664187479² = 882290014520750882, which contains 22 as substring.

Together with 664187477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664187471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332093739 + 332093740.

It is an arithmetic number, because the mean of its divisors is an integer number (332093740).

Almost surely, 2^664187479 is an apocalyptic number.

664187479 is a deficient number, since it is larger than the sum of its proper divisors (1).

664187479 is an equidigital number, since it uses as much as digits as its factorization.

664187479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 664187479 is about 25771.8349948156. The cubic root of 664187479 is about 872.4962346616.

The spelling of 664187479 in words is "six hundred sixty-four million, one hundred eighty-seven thousand, four hundred seventy-nine".