491566889255 has 16 divisors (see below), whose sum is σ = 635365293024. Its totient is φ = 362940600960.

The previous prime is 491566889249. The next prime is 491566889287. The reversal of 491566889255 is 552988665194.

It is not a de Polignac number, because 491566889255 - 2⁸ = 491566888999 is a prime.

It is a super-2 number, since 2×491566889255² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 271229 + ... + 1027958.

It is an arithmetic number, because the mean of its divisors is an integer number (39710330814).

Almost surely, 2^491566889255 is an apocalyptic number.

491566889255 is a deficient number, since it is larger than the sum of its proper divisors (143798403769).

491566889255 is a wasteful number, since it uses less digits than its factorization.

491566889255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305026.

The product of its digits is 186624000, while the sum is 68.

The spelling of 491566889255 in words is "four hundred ninety-one billion, five hundred sixty-six million, eight hundred eighty-nine thousand, two hundred fifty-five".