165541540603 has 4 divisors (see below), whose sum is σ = 165549156400. Its totient is φ = 165533924808.

The previous prime is 165541540573. The next prime is 165541540639. The reversal of 165541540603 is 306045145561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165541540603 - 2¹³ = 165541532411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165541540663) 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, 3775200 + ... + 3818797.

It is an arithmetic number, because the mean of its divisors is an integer number (41387289100).

Almost surely, 2^165541540603 is an apocalyptic number.

165541540603 is a deficient number, since it is larger than the sum of its proper divisors (7615797).

165541540603 is an equidigital number, since it uses as much as digits as its factorization.

165541540603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615796.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 165541540603 in words is "one hundred sixty-five billion, five hundred forty-one million, five hundred forty thousand, six hundred three".