664787083785 has 32 divisors (see below), whose sum is σ = 1160737084800. Its totient is φ = 322215052800.

The previous prime is 664787083759. The next prime is 664787083789. The reversal of 664787083785 is 587380787466.

It is not a de Polignac number, because 664787083785 - 2⁸ = 664787083529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664787083789) 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, 157626 + ... + 1163795.

It is an arithmetic number, because the mean of its divisors is an integer number (36273033900).

Almost surely, 2^664787083785 is an apocalyptic number.

It is an amenable number.

664787083785 is a deficient number, since it is larger than the sum of its proper divisors (495950001015).

664787083785 is a wasteful number, since it uses less digits than its factorization.

664787083785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324489.

The product of its (nonzero) digits is 379330560, while the sum is 69.

The spelling of 664787083785 in words is "six hundred sixty-four billion, seven hundred eighty-seven million, eighty-three thousand, seven hundred eighty-five".