1664162531 has 4 divisors (see below), whose sum is σ = 1686959352. Its totient is φ = 1641365712.

The previous prime is 1664162509. The next prime is 1664162551. The reversal of 1664162531 is 1352614661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1664162531 - 2¹⁴ = 1664146147 is a prime.

It is a super-2 number, since 2×1664162531² = 5538873859168651922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664162491 and 1664162500.

It is not an unprimeable number, because it can be changed into a prime (1664162551) 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, 11398301 + ... + 11398446.

It is an arithmetic number, because the mean of its divisors is an integer number (421739838).

Almost surely, 2^1664162531 is an apocalyptic number.

1664162531 is a deficient number, since it is larger than the sum of its proper divisors (22796821).

1664162531 is an equidigital number, since it uses as much as digits as its factorization.

1664162531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22796820.

The product of its digits is 25920, while the sum is 35.

The square root of 1664162531 is about 40794.1482445706. The cubic root of 1664162531 is about 1185.0370076332.

The spelling of 1664162531 in words is "one billion, six hundred sixty-four million, one hundred sixty-two thousand, five hundred thirty-one".