1161951266549 has 2 divisors, whose sum is σ = 1161951266550. Its totient is φ = 1161951266548.

The previous prime is 1161951266533. The next prime is 1161951266569. The reversal of 1161951266549 is 9456621591611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1015046175025 + 146905091524 = 1007495^2 + 383282^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161951266549 - 2⁴ = 1161951266533 is a prime.

It is a super-5 number, since 5×1161951266549⁵ (a number of 62 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1161951266494 and 1161951266503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161951266569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580975633274 + 580975633275.

It is an arithmetic number, because the mean of its divisors is an integer number (580975633275).

Almost surely, 2^{1161951266549} is an apocalyptic number.

It is an amenable number.

1161951266549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161951266549 is an equidigital number, since it uses as much as digits as its factorization.

1161951266549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 56.

The spelling of 1161951266549 in words is "one trillion, one hundred sixty-one billion, nine hundred fifty-one million, two hundred sixty-six thousand, five hundred forty-nine".