1664050243 has 4 divisors (see below), whose sum is σ = 1667644768. Its totient is φ = 1660455720.

The previous prime is 1664050183. The next prime is 1664050261. The reversal of 1664050243 is 3420504661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3420504661 = 7 ⋅488643523.

It is a cyclic number.

It is not a de Polignac number, because 1664050243 - 2¹⁷ = 1663919171 is a prime.

It is a super-2 number, since 2×1664050243² = 5538126422456718098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664050273) 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, 1796568 + ... + 1797493.

It is an arithmetic number, because the mean of its divisors is an integer number (416911192).

Almost surely, 2^1664050243 is an apocalyptic number.

1664050243 is a deficient number, since it is larger than the sum of its proper divisors (3594525).

1664050243 is an equidigital number, since it uses as much as digits as its factorization.

1664050243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3594524.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1664050243 is about 40792.7719455298. The cubic root of 1664050243 is about 1185.0103539008.

The spelling of 1664050243 in words is "one billion, six hundred sixty-four million, fifty thousand, two hundred forty-three".