1165404135601 has 2 divisors, whose sum is σ = 1165404135602. Its totient is φ = 1165404135600.

The previous prime is 1165404135589. The next prime is 1165404135607. The reversal of 1165404135601 is 1065314045611.

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., 636606111376 + 528798024225 = 797876^2 + 727185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165404135601 - 2³⁹ = 615648321713 is a prime.

It is a super-3 number, since 3×1165404135601³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1165404135607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582702067800 + 582702067801.

It is an arithmetic number, because the mean of its divisors is an integer number (582702067801).

Almost surely, 2^{1165404135601} is an apocalyptic number.

It is an amenable number.

1165404135601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165404135601 is an equidigital number, since it uses as much as digits as its factorization.

1165404135601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 1165404135601 in words is "one trillion, one hundred sixty-five billion, four hundred four million, one hundred thirty-five thousand, six hundred one".