11661603 has 8 divisors (see below), whose sum is σ = 15566016. Its totient is φ = 7765800.

The previous prime is 11661571. The next prime is 11661607. The reversal of 11661603 is 30616611.

11661603 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11661603 - 2⁵ = 11661571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11661607) 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, 2368 + ... + 5378.

It is an arithmetic number, because the mean of its divisors is an integer number (1945752).

Almost surely, 2^11661603 is an apocalyptic number.

11661603 is a deficient number, since it is larger than the sum of its proper divisors (3904413).

11661603 is a wasteful number, since it uses less digits than its factorization.

11661603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 11661603 is about 3414.9089299716. The cubic root of 11661603 is about 226.7702527791.

The spelling of 11661603 in words is "eleven million, six hundred sixty-one thousand, six hundred three".