11661603236 has 6 divisors (see below), whose sum is σ = 20407805670. Its totient is φ = 5830801616.

The previous prime is 11661603209. The next prime is 11661603251. The reversal of 11661603236 is 63230616611.

It can be written as a sum of positive squares in only one way, i.e., 10050062500 + 1611540736 = 100250^2 + 40144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11661603196 and 11661603205.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1457700401 + ... + 1457700408.

It is an arithmetic number, because the mean of its divisors is an integer number (3401300945).

Almost surely, 2^11661603236 is an apocalyptic number.

It is an amenable number.

11661603236 is a deficient number, since it is larger than the sum of its proper divisors (8746202434).

11661603236 is a wasteful number, since it uses less digits than its factorization.

11661603236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915400813 (or 2915400811 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 11661603236 in words is "eleven billion, six hundred sixty-one million, six hundred three thousand, two hundred thirty-six".