1111727617661 has 4 divisors (see below), whose sum is σ = 1112730078300. Its totient is φ = 1110725157024.

The previous prime is 1111727617607. The next prime is 1111727617733. The reversal of 1111727617661 is 1667167271111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211904629561 + 899822988100 = 460331^2 + 948590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111727617661 is a prime.

It is a super-2 number, since 2×1111727617661² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111727617261) 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, 501228656 + ... + 501230873.

It is an arithmetic number, because the mean of its divisors is an integer number (278182519575).

Almost surely, 2^{1111727617661} is an apocalyptic number.

It is an amenable number.

1111727617661 is a deficient number, since it is larger than the sum of its proper divisors (1002460639).

1111727617661 is a wasteful number, since it uses less digits than its factorization.

1111727617661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002460638.

The product of its digits is 148176, while the sum is 47.

The spelling of 1111727617661 in words is "one trillion, one hundred eleven billion, seven hundred twenty-seven million, six hundred seventeen thousand, six hundred sixty-one".