6155005065661 has 2 divisors, whose sum is σ = 6155005065662. Its totient is φ = 6155005065660.

The previous prime is 6155005065553. The next prime is 6155005065667. The reversal of 6155005065661 is 1665605005516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5813137992025 + 341867073636 = 2411045^2 + 584694^2 .

It is a cyclic number.

It is not a de Polignac number, because 6155005065661 - 2²¹ = 6155002968509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6155005065667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077502532830 + 3077502532831.

It is an arithmetic number, because the mean of its divisors is an integer number (3077502532831).

Almost surely, 2^{6155005065661} is an apocalyptic number.

It is an amenable number.

6155005065661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6155005065661 is an equidigital number, since it uses as much as digits as its factorization.

6155005065661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 6155005065661 in words is "six trillion, one hundred fifty-five billion, five million, sixty-five thousand, six hundred sixty-one".