165427813 has 4 divisors (see below), whose sum is σ = 174134560. Its totient is φ = 156721068.

The previous prime is 165427793. The next prime is 165427831. The reversal of 165427813 is 318724561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165427813 - 2⁵ = 165427781 is a prime.

It is a super-2 number, since 2×165427813² = 54732722627925938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165427013) 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, 4353345 + ... + 4353382.

It is an arithmetic number, because the mean of its divisors is an integer number (43533640).

Almost surely, 2^165427813 is an apocalyptic number.

It is an amenable number.

165427813 is a deficient number, since it is larger than the sum of its proper divisors (8706747).

165427813 is an equidigital number, since it uses as much as digits as its factorization.

165427813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8706746.

The product of its digits is 40320, while the sum is 37.

The square root of 165427813 is about 12861.8743968366. The cubic root of 165427813 is about 548.9542807948.

The spelling of 165427813 in words is "one hundred sixty-five million, four hundred twenty-seven thousand, eight hundred thirteen".