1241665663 has 4 divisors (see below), whose sum is σ = 1419046480. Its totient is φ = 1064284848.

The previous prime is 1241665657. The next prime is 1241665697. The reversal of 1241665663 is 3665661421.

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 1241665663 - 2⁵ = 1241665631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1241665643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88690398 + ... + 88690411.

It is an arithmetic number, because the mean of its divisors is an integer number (354761620).

Almost surely, 2^1241665663 is an apocalyptic number.

1241665663 is a deficient number, since it is larger than the sum of its proper divisors (177380817).

1241665663 is an equidigital number, since it uses as much as digits as its factorization.

1241665663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177380816.

The product of its digits is 155520, while the sum is 40.

The square root of 1241665663 is about 35237.2766115658. The cubic root of 1241665663 is about 1074.8178997118.

The spelling of 1241665663 in words is "one billion, two hundred forty-one million, six hundred sixty-five thousand, six hundred sixty-three".