1155010651661 has 4 divisors (see below), whose sum is σ = 1155020205024. Its totient is φ = 1155001098300.

The previous prime is 1155010651579. The next prime is 1155010651679. The reversal of 1155010651661 is 1661560105511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155010651661 - 2³⁰ = 1153936909837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155015651661) 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, 4592975 + ... + 4837916.

It is an arithmetic number, because the mean of its divisors is an integer number (288755051256).

Almost surely, 2^{1155010651661} is an apocalyptic number.

It is an amenable number.

1155010651661 is a deficient number, since it is larger than the sum of its proper divisors (9553363).

1155010651661 is an equidigital number, since it uses as much as digits as its factorization.

1155010651661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9553362.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 1155010651661 in words is "one trillion, one hundred fifty-five billion, ten million, six hundred fifty-one thousand, six hundred sixty-one".