1664353231 has 8 divisors (see below), whose sum is σ = 1691000064. Its totient is φ = 1637759640.

The previous prime is 1664353217. The next prime is 1664353253. The reversal of 1664353231 is 1323534661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664353231 is a prime.

It is a super-2 number, since 2×1664353231² = 5540143355080278722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664353291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52266 + ... + 77848.

It is an arithmetic number, because the mean of its divisors is an integer number (211375008).

Almost surely, 2^1664353231 is an apocalyptic number.

1664353231 is a deficient number, since it is larger than the sum of its proper divisors (26646833).

1664353231 is an equidigital number, since it uses as much as digits as its factorization.

1664353231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26621.

The product of its digits is 38880, while the sum is 34.

The square root of 1664353231 is about 40796.4855226526. The cubic root of 1664353231 is about 1185.0822712261.

Adding to 1664353231 its reverse (1323534661), we get a palindrome (2987887892).

The spelling of 1664353231 in words is "one billion, six hundred sixty-four million, three hundred fifty-three thousand, two hundred thirty-one".