1165501661249 has 2 divisors, whose sum is σ = 1165501661250. Its totient is φ = 1165501661248.

The previous prime is 1165501661161. The next prime is 1165501661287. The reversal of 1165501661249 is 9421661055611.

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., 1163928111025 + 1573550224 = 1078855^2 + 39668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165501661249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165501661449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582750830624 + 582750830625.

It is an arithmetic number, because the mean of its divisors is an integer number (582750830625).

Almost surely, 2^{1165501661249} is an apocalyptic number.

It is an amenable number.

1165501661249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165501661249 is an equidigital number, since it uses as much as digits as its factorization.

1165501661249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 1165501661249 in words is "one trillion, one hundred sixty-five billion, five hundred one million, six hundred sixty-one thousand, two hundred forty-nine".