491611672260 has 288 divisors, whose sum is σ = 1597781203200. Its totient is φ = 121988643840.

The previous prime is 491611672249. The next prime is 491611672283. The reversal of 491611672260 is 62276116194.

491611672260 is a `hidden beast` number, since 4 + 9 + 1 + 611 + 6 + 7 + 2 + 26 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 67257486 + ... + 67264794.

It is an arithmetic number, because the mean of its divisors is an integer number (5547851400).

Almost surely, 2^491611672260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491611672260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798890601600).

491611672260 is an abundant number, since it is smaller than the sum of its proper divisors (1106169530940).

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

491611672260 is a wasteful number, since it uses less digits than its factorization.

491611672260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7691 (or 7686 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 491611672260 in words is "four hundred ninety-one billion, six hundred eleven million, six hundred seventy-two thousand, two hundred sixty".