1161126221661 has 12 divisors (see below), whose sum is σ = 1916779794592. Its totient is φ = 663500698056.

The previous prime is 1161126221603. The next prime is 1161126221711. The reversal of 1161126221661 is 1661226211611.

1161126221661 is a `hidden beast` number, since 1 + 1 + 6 + 1 + 12 + 622 + 16 + 6 + 1 = 666.

It is not a de Polignac number, because 1161126221661 - 2¹⁸ = 1161125959517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161126221261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9215287411 + ... + 9215287536.

Almost surely, 2^{1161126221661} is an apocalyptic number.

It is an amenable number.

1161126221661 is a deficient number, since it is larger than the sum of its proper divisors (755653572931).

1161126221661 is a wasteful number, since it uses less digits than its factorization.

1161126221661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18430574960 (or 18430574957 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The spelling of 1161126221661 in words is "one trillion, one hundred sixty-one billion, one hundred twenty-six million, two hundred twenty-one thousand, six hundred sixty-one".