11618506239649 has 3 divisors (see below), whose sum is σ = 11618509648243. Its totient is φ = 11618502831056.

The previous prime is 11618506239617. The next prime is 11618506239719. The reversal of 11618506239649 is 94693260581611.

It is a happy number.

The square root of 11618506239649 is 3408593.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10485064944225 + 1133441295424 = 3238065^2 + 1064632^2 .

It is not a de Polignac number, because 11618506239649 - 2⁵ = 11618506239617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11618506209649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1704297 + ... + 5112889.

Almost surely, 2^{11618506239649} is an apocalyptic number.

11618506239649 is the 3408593-rd square number.

11618506239649 is the 1704297-th centered octagonal number.

It is an amenable number.

11618506239649 is a deficient number, since it is larger than the sum of its proper divisors (3408594).

11618506239649 is an frugal number, since it uses more digits than its factorization.

11618506239649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817186 (or 3408593 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 61.

The spelling of 11618506239649 in words is "eleven trillion, six hundred eighteen billion, five hundred six million, two hundred thirty-nine thousand, six hundred forty-nine".