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1155115645661 is a prime number
BaseRepresentation
bin10000110011110010010…
…000011111101011011101
311002102112222212122221102
4100303302100133223131
5122411134101130121
62242353001042445
7146311561662065
oct20636220375335
94072488778842
101155115645661
1140597773937a
12167a51a86425
1384c08637863
143dc9d3a03a5
15200a94e290b
hex10cf241fadd

1155115645661 has 2 divisors, whose sum is σ = 1155115645662. Its totient is φ = 1155115645660.

The previous prime is 1155115645637. The next prime is 1155115645679. The reversal of 1155115645661 is 1665465115511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586495588900 + 568620056761 = 765830^2 + 754069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155115645661 - 230 = 1154041903837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155415645661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577557822830 + 577557822831.

It is an arithmetic number, because the mean of its divisors is an integer number (577557822831).

Almost surely, 21155115645661 is an apocalyptic number.

It is an amenable number.

1155115645661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155115645661 is an equidigital number, since it uses as much as digits as its factorization.

1155115645661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540000, while the sum is 47.

The spelling of 1155115645661 in words is "one trillion, one hundred fifty-five billion, one hundred fifteen million, six hundred forty-five thousand, six hundred sixty-one".