1011118005661 has 2 divisors, whose sum is σ = 1011118005662. Its totient is φ = 1011118005660.

The previous prime is 1011118005619. The next prime is 1011118005707. The reversal of 1011118005661 is 1665008111101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917294640025 + 93823365636 = 957755^2 + 306306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011118005661 - 2³¹ = 1008970522013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011118000661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505559002830 + 505559002831.

It is an arithmetic number, because the mean of its divisors is an integer number (505559002831).

Almost surely, 2^{1011118005661} is an apocalyptic number.

It is an amenable number.

1011118005661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011118005661 is an equidigital number, since it uses as much as digits as its factorization.

1011118005661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 31.

The spelling of 1011118005661 in words is "one trillion, eleven billion, one hundred eighteen million, five thousand, six hundred sixty-one".