664743487 has 2 divisors, whose sum is σ = 664743488. Its totient is φ = 664743486.

The previous prime is 664743479. The next prime is 664743551. The reversal of 664743487 is 784347466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664743487 - 2³ = 664743479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664743487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664743467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332371743 + 332371744.

It is an arithmetic number, because the mean of its divisors is an integer number (332371744).

Almost surely, 2^664743487 is an apocalyptic number.

664743487 is a deficient number, since it is larger than the sum of its proper divisors (1).

664743487 is an equidigital number, since it uses as much as digits as its factorization.

664743487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 49.

The square root of 664743487 is about 25782.6198630007. The cubic root of 664743487 is about 872.7396295852.

The spelling of 664743487 in words is "six hundred sixty-four million, seven hundred forty-three thousand, four hundred eighty-seven".