165894997 has 4 divisors (see below), whose sum is σ = 165928716. Its totient is φ = 165861280.

The previous prime is 165894991. The next prime is 165895003. The reversal of 165894997 is 799498561.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (165894991) and next prime (165895003).

It can be written as a sum of positive squares in 2 ways, for example, as 67667076 + 98227921 = 8226^2 + 9911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165894997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165894991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7888 + ... + 19849.

It is an arithmetic number, because the mean of its divisors is an integer number (41482179).

Almost surely, 2^165894997 is an apocalyptic number.

It is an amenable number.

165894997 is a deficient number, since it is larger than the sum of its proper divisors (33719).

165894997 is an equidigital number, since it uses as much as digits as its factorization.

165894997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33718.

The product of its digits is 4898880, while the sum is 58.

The square root of 165894997 is about 12880.0231754450. The cubic root of 165894997 is about 549.4705615924.

The spelling of 165894997 in words is "one hundred sixty-five million, eight hundred ninety-four thousand, nine hundred ninety-seven".