165278641 has 16 divisors (see below), whose sum is σ = 192786048. Its totient is φ = 140025600.

The previous prime is 165278629. The next prime is 165278651. The reversal of 165278641 is 146872561.

It is not a de Polignac number, because 165278641 - 2⁵ = 165278609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165278594 and 165278603.

It is not an unprimeable number, because it can be changed into a prime (165278651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14971 + ... + 23551.

It is an arithmetic number, because the mean of its divisors is an integer number (12049128).

Almost surely, 2^165278641 is an apocalyptic number.

165278641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165278641 is a deficient number, since it is larger than the sum of its proper divisors (27507407).

165278641 is a wasteful number, since it uses less digits than its factorization.

165278641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8712.

The product of its digits is 80640, while the sum is 40.

The square root of 165278641 is about 12856.0740897056. The cubic root of 165278641 is about 548.7892274647.

The spelling of 165278641 in words is "one hundred sixty-five million, two hundred seventy-eight thousand, six hundred forty-one".