496820189981 has 4 divisors (see below), whose sum is σ = 513951920700. Its totient is φ = 479688459264.

The previous prime is 496820189953. The next prime is 496820189989. The reversal of 496820189981 is 189981028694.

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

It can be written as a sum of positive squares in 2 ways, for example, as 120229321081 + 376590868900 = 346741^2 + 613670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-496820189981 is a prime.

It is a super-2 number, since 2×496820189981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (496820189989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8565865316 + ... + 8565865373.

It is an arithmetic number, because the mean of its divisors is an integer number (128487980175).

Almost surely, 2^496820189981 is an apocalyptic number.

It is an amenable number.

496820189981 is a deficient number, since it is larger than the sum of its proper divisors (17131730719).

496820189981 is a wasteful number, since it uses less digits than its factorization.

496820189981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17131730718.

The product of its (nonzero) digits is 17915904, while the sum is 65.

The spelling of 496820189981 in words is "four hundred ninety-six billion, eight hundred twenty million, one hundred eighty-nine thousand, nine hundred eighty-one".