491839617545 has 8 divisors (see below), whose sum is σ = 590340467400. Its totient is φ = 393383076480.

The previous prime is 491839617539. The next prime is 491839617557. The reversal of 491839617545 is 545716938194.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10699006096 + 481140611449 = 103436^2 + 693643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491839617545 - 2⁸ = 491839617289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11052770 + ... + 11097179.

It is an arithmetic number, because the mean of its divisors is an integer number (73792558425).

Almost surely, 2^491839617545 is an apocalyptic number.

It is an amenable number.

491839617545 is a deficient number, since it is larger than the sum of its proper divisors (98500849855).

491839617545 is a wasteful number, since it uses less digits than its factorization.

491839617545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22154395.

The product of its digits is 32659200, while the sum is 62.

The spelling of 491839617545 in words is "four hundred ninety-one billion, eight hundred thirty-nine million, six hundred seventeen thousand, five hundred forty-five".