1665201241 has 16 divisors (see below), whose sum is σ = 1864719936. Its totient is φ = 1474200000.

The previous prime is 1665201233. The next prime is 1665201253. The reversal of 1665201241 is 1421025661.

It is a cyclic number.

It is not a de Polignac number, because 1665201241 - 2³ = 1665201233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665201271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55486 + ... + 80056.

It is an arithmetic number, because the mean of its divisors is an integer number (116544996).

Almost surely, 2^1665201241 is an apocalyptic number.

1665201241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1665201241 is a deficient number, since it is larger than the sum of its proper divisors (199518695).

1665201241 is a wasteful number, since it uses less digits than its factorization.

1665201241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24744.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1665201241 is about 40806.8773737957. The cubic root of 1665201241 is about 1185.2835087530.

It can be divided in two parts, 166520 and 1241, that added together give a palindrome (167761).

The spelling of 1665201241 in words is "one billion, six hundred sixty-five million, two hundred one thousand, two hundred forty-one".