491555265312 has 48 divisors (see below), whose sum is σ = 1294535686752. Its totient is φ = 163318026240.

The previous prime is 491555265287. The next prime is 491555265329. The reversal of 491555265312 is 213562555194.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8309889 + ... + 8368832.

It is an arithmetic number, because the mean of its divisors is an integer number (26969493474).

Almost surely, 2^491555265312 is an apocalyptic number.

It is an amenable number.

491555265312 is an abundant number, since it is smaller than the sum of its proper divisors (802980421440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491555265312 is a wasteful number, since it uses less digits than its factorization.

491555265312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16679041 (or 16679033 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 48.

The spelling of 491555265312 in words is "four hundred ninety-one billion, five hundred fifty-five million, two hundred sixty-five thousand, three hundred twelve".