65550120091 has 2 divisors, whose sum is σ = 65550120092. Its totient is φ = 65550120090.

The previous prime is 65550120019. The next prime is 65550120109. The reversal of 65550120091 is 19002105556.

Together with next prime (65550120109) it forms an Ormiston pair, because they use the same digits, order apart.

Together with previous prime (65550120019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65550120091 - 2¹¹ = 65550118043 is a prime.

It is not a weakly prime, because it can be changed into another prime (65550120491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32775060045 + 32775060046.

It is an arithmetic number, because the mean of its divisors is an integer number (32775060046).

Almost surely, 2^65550120091 is an apocalyptic number.

65550120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

65550120091 is an equidigital number, since it uses as much as digits as its factorization.

65550120091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 34.

The spelling of 65550120091 in words is "sixty-five billion, five hundred fifty million, one hundred twenty thousand, ninety-one".