491980600905 has 16 divisors (see below), whose sum is σ = 787182914304. Its totient is φ = 262385002880.

The previous prime is 491980600901. The next prime is 491980600921. The reversal of 491980600905 is 509006089194.

It is not a de Polignac number, because 491980600905 - 2² = 491980600901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491980600901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690637 + ... + 1208693.

It is an arithmetic number, because the mean of its divisors is an integer number (49198932144).

Almost surely, 2^491980600905 is an apocalyptic number.

It is an amenable number.

491980600905 is a deficient number, since it is larger than the sum of its proper divisors (295202313399).

491980600905 is a wasteful number, since it uses less digits than its factorization.

491980600905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581376.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 491980600905 in words is "four hundred ninety-one billion, nine hundred eighty million, six hundred thousand, nine hundred five".