491617502905 has 16 divisors (see below), whose sum is σ = 590807234304. Its totient is φ = 392716883520.

The previous prime is 491617502903. The next prime is 491617502911. The reversal of 491617502905 is 509205716194.

It is a happy number.

It is not a de Polignac number, because 491617502905 - 2¹ = 491617502903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491617502903) 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, 11484652 + ... + 11527378.

It is an arithmetic number, because the mean of its divisors is an integer number (36925452144).

Almost surely, 2^491617502905 is an apocalyptic number.

It is an amenable number.

491617502905 is a deficient number, since it is larger than the sum of its proper divisors (99189731399).

491617502905 is a wasteful number, since it uses less digits than its factorization.

491617502905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46056.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 491617502905 in words is "four hundred ninety-one billion, six hundred seventeen million, five hundred two thousand, nine hundred five".