664411831 has 4 divisors (see below), whose sum is σ = 664465464. Its totient is φ = 664358200.

The previous prime is 664411801. The next prime is 664411841. The reversal of 664411831 is 138114466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 664411831 - 2¹¹ = 664409783 is a prime.

It is a super-3 number, since 3×664411831³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664411801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2316 + ... + 36526.

It is an arithmetic number, because the mean of its divisors is an integer number (166116366).

Almost surely, 2^664411831 is an apocalyptic number.

664411831 is a deficient number, since it is larger than the sum of its proper divisors (53633).

664411831 is a wasteful number, since it uses less digits than its factorization.

664411831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53632.

The product of its digits is 13824, while the sum is 34.

The square root of 664411831 is about 25776.1872859428. The cubic root of 664411831 is about 872.5944620676.

The spelling of 664411831 in words is "six hundred sixty-four million, four hundred eleven thousand, eight hundred thirty-one".