1665420233 has 8 divisors (see below), whose sum is σ = 1700222400. Its totient is φ = 1630933360.

The previous prime is 1665420227. The next prime is 1665420247. The reversal of 1665420233 is 3320245661.

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-1665420233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665420233.

It is not an unprimeable number, because it can be changed into a prime (1665420293) 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, 68135 + ... + 89292.

It is an arithmetic number, because the mean of its divisors is an integer number (212527800).

Almost surely, 2^1665420233 is an apocalyptic number.

It is an amenable number.

1665420233 is a deficient number, since it is larger than the sum of its proper divisors (34802167).

1665420233 is a wasteful number, since it uses less digits than its factorization.

1665420233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157647.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1665420233 is about 40809.5605587710. The cubic root of 1665420233 is about 1185.3354656821.

Adding to 1665420233 its reverse (3320245661), we get a palindrome (4985665894).

The spelling of 1665420233 in words is "one billion, six hundred sixty-five million, four hundred twenty thousand, two hundred thirty-three".