165746761897 has 2 divisors, whose sum is σ = 165746761898. Its totient is φ = 165746761896.

The previous prime is 165746761879. The next prime is 165746761931. The reversal of 165746761897 is 798167647561.

Together with previous prime (165746761879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165737737881 + 9024016 = 407109^2 + 3004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165746761897 is a prime.

It is a super-2 number, since 2×165746761897² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165746762897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82873380948 + 82873380949.

It is an arithmetic number, because the mean of its divisors is an integer number (82873380949).

Almost surely, 2^165746761897 is an apocalyptic number.

It is an amenable number.

165746761897 is a deficient number, since it is larger than the sum of its proper divisors (1).

165746761897 is an equidigital number, since it uses as much as digits as its factorization.

165746761897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106686720, while the sum is 67.

The spelling of 165746761897 in words is "one hundred sixty-five billion, seven hundred forty-six million, seven hundred sixty-one thousand, eight hundred ninety-seven".