1011017018861 has 2 divisors, whose sum is σ = 1011017018862. Its totient is φ = 1011017018860.

The previous prime is 1011017018807. The next prime is 1011017018881. The reversal of 1011017018861 is 1688107101101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 721471866025 + 289545152836 = 849395^2 + 538094^2 .

It is an emirp because it is prime and its reverse (1688107101101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011017018861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011017018881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505508509430 + 505508509431.

It is an arithmetic number, because the mean of its divisors is an integer number (505508509431).

Almost surely, 2^{1011017018861} is an apocalyptic number.

It is an amenable number.

1011017018861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011017018861 is an equidigital number, since it uses as much as digits as its factorization.

1011017018861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 35.

The spelling of 1011017018861 in words is "one trillion, eleven billion, seventeen million, eighteen thousand, eight hundred sixty-one".