65991088811 has 2 divisors, whose sum is σ = 65991088812. Its totient is φ = 65991088810.

The previous prime is 65991088783. The next prime is 65991088861. The reversal of 65991088811 is 11888019956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65991088811 - 2¹⁸ = 65990826667 is a prime.

It is a super-2 number, since 2×65991088811² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65991088861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32995544405 + 32995544406.

It is an arithmetic number, because the mean of its divisors is an integer number (32995544406).

Almost surely, 2^65991088811 is an apocalyptic number.

65991088811 is a deficient number, since it is larger than the sum of its proper divisors (1).

65991088811 is an equidigital number, since it uses as much as digits as its factorization.

65991088811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 56.

The spelling of 65991088811 in words is "sixty-five billion, nine hundred ninety-one million, eighty-eight thousand, eight hundred eleven".