665894889363 has 16 divisors (see below), whose sum is σ = 984990902400. Its totient is φ = 396732444480.

The previous prime is 665894889347. The next prime is 665894889391. The reversal of 665894889363 is 363988498566.

It is not a de Polignac number, because 665894889363 - 2⁴ = 665894889347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665894889323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171003418 + ... + 171007311.

It is an arithmetic number, because the mean of its divisors is an integer number (61561931400).

Almost surely, 2^665894889363 is an apocalyptic number.

665894889363 is a deficient number, since it is larger than the sum of its proper divisors (319096013037).

665894889363 is a wasteful number, since it uses less digits than its factorization.

665894889363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342010802.

The product of its digits is 1612431360, while the sum is 75.

The spelling of 665894889363 in words is "six hundred sixty-five billion, eight hundred ninety-four million, eight hundred eighty-nine thousand, three hundred sixty-three".