165390763 has 4 divisors (see below), whose sum is σ = 174095560. Its totient is φ = 156685968.

The previous prime is 165390749. The next prime is 165390767. The reversal of 165390763 is 367093561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 367093561 = 727 ⋅504943.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165390763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165390767) 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 3 ways as a sum of consecutive naturals, for example, 4352370 + ... + 4352407.

It is an arithmetic number, because the mean of its divisors is an integer number (43523890).

Almost surely, 2^165390763 is an apocalyptic number.

165390763 is a deficient number, since it is larger than the sum of its proper divisors (8704797).

165390763 is an equidigital number, since it uses as much as digits as its factorization.

165390763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704796.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 165390763 is about 12860.4340128940. The cubic root of 165390763 is about 548.9132955974.

It can be divided in two parts, 1653 and 90763, that added together give a square (92416 = 304²).

The spelling of 165390763 in words is "one hundred sixty-five million, three hundred ninety thousand, seven hundred sixty-three".