165148681 has 4 divisors (see below), whose sum is σ = 168989392. Its totient is φ = 161307972.

The previous prime is 165148679. The next prime is 165148733. The reversal of 165148681 is 186841561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 186841561 = 13669².

It is a cyclic number.

It is not a de Polignac number, because 165148681 - 2¹ = 165148679 is a prime.

It is a super-2 number, since 2×165148681² = 54548173672079522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165148601) 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, 1920291 + ... + 1920376.

It is an arithmetic number, because the mean of its divisors is an integer number (42247348).

Almost surely, 2^165148681 is an apocalyptic number.

It is an amenable number.

165148681 is a deficient number, since it is larger than the sum of its proper divisors (3840711).

165148681 is an equidigital number, since it uses as much as digits as its factorization.

165148681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840710.

The product of its digits is 46080, while the sum is 40.

The square root of 165148681 is about 12851.0186755759. The cubic root of 165148681 is about 548.6453505365.

The spelling of 165148681 in words is "one hundred sixty-five million, one hundred forty-eight thousand, six hundred eighty-one".