664512783 has 32 divisors (see below), whose sum is σ = 1020211200. Its totient is φ = 380498400.

The previous prime is 664512773. The next prime is 664512787. The reversal of 664512783 is 387215466.

It is not a de Polignac number, because 664512783 - 2¹⁶ = 664447247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664512787) 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 in 31 ways as a sum of consecutive naturals, for example, 269008 + ... + 271466.

It is an arithmetic number, because the mean of its divisors is an integer number (31881600).

Almost surely, 2^664512783 is an apocalyptic number.

664512783 is a deficient number, since it is larger than the sum of its proper divisors (355698417).

664512783 is a wasteful number, since it uses less digits than its factorization.

664512783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923.

The product of its digits is 241920, while the sum is 42.

The square root of 664512783 is about 25778.1454530771. The cubic root of 664512783 is about 872.6386543847.

The spelling of 664512783 in words is "six hundred sixty-four million, five hundred twelve thousand, seven hundred eighty-three".