165403990963 has 18 divisors (see below), whose sum is σ = 171118332924. Its totient is φ = 159793881408.

The previous prime is 165403990957. The next prime is 165403990979. The reversal of 165403990963 is 369099304561.

165403990963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165403990963 - 2¹³ = 165403982771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165403990943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 290692143 + ... + 290692711.

Almost surely, 2^165403990963 is an apocalyptic number.

165403990963 is a deficient number, since it is larger than the sum of its proper divisors (5714341961).

165403990963 is an frugal number, since it uses more digits than its factorization.

165403990963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 4723920, while the sum is 55.

The spelling of 165403990963 in words is "one hundred sixty-five billion, four hundred three million, nine hundred ninety thousand, nine hundred sixty-three".