11660861603 has 4 divisors (see below), whose sum is σ = 11661576600. Its totient is φ = 11660146608.

The previous prime is 11660861587. The next prime is 11660861669. The reversal of 11660861603 is 30616806611.

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 11660861603 - 2⁴ = 11660861587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11660861683) 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, 332450 + ... + 365847.

It is an arithmetic number, because the mean of its divisors is an integer number (2915394150).

Almost surely, 2^11660861603 is an apocalyptic number.

11660861603 is a deficient number, since it is larger than the sum of its proper divisors (714997).

11660861603 is an equidigital number, since it uses as much as digits as its factorization.

11660861603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714996.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 11660861603 in words is "eleven billion, six hundred sixty million, eight hundred sixty-one thousand, six hundred three".