1049326665991 has 2 divisors, whose sum is σ = 1049326665992. Its totient is φ = 1049326665990.

The previous prime is 1049326665979. The next prime is 1049326666033. The reversal of 1049326665991 is 1995666239401.

It is a weak prime.

It is an emirp because it is prime and its reverse (1995666239401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1049326665991 - 2²¹ = 1049324568839 is a prime.

It is a super-2 number, since 2×1049326665991² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1049326665931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 524663332995 + 524663332996.

It is an arithmetic number, because the mean of its divisors is an integer number (524663332996).

Almost surely, 2^{1049326665991} is an apocalyptic number.

1049326665991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1049326665991 is an equidigital number, since it uses as much as digits as its factorization.

1049326665991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18895680, while the sum is 61.

The spelling of 1049326665991 in words is "one trillion, forty-nine billion, three hundred twenty-six million, six hundred sixty-five thousand, nine hundred ninety-one".