664824825831 has 16 divisors (see below), whose sum is σ = 887342579424. Its totient is φ = 442762043904.

The previous prime is 664824825817. The next prime is 664824825877. The reversal of 664824825831 is 138528428466.

It is not a de Polignac number, because 664824825831 - 2⁷ = 664824825703 is a prime.

It is a super-2 number, since 2×664824825831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664824825331) 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 in 15 ways as a sum of consecutive naturals, for example, 12286171 + ... + 12340163.

It is an arithmetic number, because the mean of its divisors is an integer number (55458911214).

Almost surely, 2^664824825831 is an apocalyptic number.

664824825831 is a deficient number, since it is larger than the sum of its proper divisors (222517753593).

664824825831 is a wasteful number, since it uses less digits than its factorization.

664824825831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58130.

The product of its digits is 17694720, while the sum is 57.

The spelling of 664824825831 in words is "six hundred sixty-four billion, eight hundred twenty-four million, eight hundred twenty-five thousand, eight hundred thirty-one".