11661226355216 has 20 divisors (see below), whose sum is σ = 22594837382124. Its totient is φ = 5830300579200.

The previous prime is 11661226355179. The next prime is 11661226355263. The reversal of 11661226355216 is 61255362216611.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1422762297616 + 10238464057600 = 1192796^2 + 3199760^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19229495 + ... + 19826646.

Almost surely, 2^{11661226355216} is an apocalyptic number.

11661226355216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11661226355216 is a deficient number, since it is larger than the sum of its proper divisors (10933611026908).

11661226355216 is a wasteful number, since it uses less digits than its factorization.

11661226355216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39074810 (or 39074804 counting only the distinct ones).

The product of its digits is 777600, while the sum is 47.

The spelling of 11661226355216 in words is "eleven trillion, six hundred sixty-one billion, two hundred twenty-six million, three hundred fifty-five thousand, two hundred sixteen".