1165404136321 has 2 divisors, whose sum is σ = 1165404136322. Its totient is φ = 1165404136320.

The previous prime is 1165404136277. The next prime is 1165404136373. The reversal of 1165404136321 is 1236314045611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032296640400 + 133107495921 = 1016020^2 + 364839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165404136321 - 2¹³ = 1165404128129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1165404136121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582702068160 + 582702068161.

It is an arithmetic number, because the mean of its divisors is an integer number (582702068161).

Almost surely, 2^{1165404136321} is an apocalyptic number.

It is an amenable number.

1165404136321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165404136321 is an equidigital number, since it uses as much as digits as its factorization.

1165404136321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 1165404136321 in words is "one trillion, one hundred sixty-five billion, four hundred four million, one hundred thirty-six thousand, three hundred twenty-one".