491550701778 has 24 divisors (see below), whose sum is σ = 1078507872000. Its totient is φ = 161776179864.

The previous prime is 491550701729. The next prime is 491550701861. The reversal of 491550701778 is 877107055194.

491550701778 is a `hidden beast` number, since 4 + 9 + 1 + 550 + 7 + 0 + 17 + 78 = 666.

491550701778 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×491550701778² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172836378 + ... + 172839221.

It is an arithmetic number, because the mean of its divisors is an integer number (44937828000).

Almost surely, 2^491550701778 is an apocalyptic number.

491550701778 is an abundant number, since it is smaller than the sum of its proper divisors (586957170222).

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

491550701778 is a wasteful number, since it uses less digits than its factorization.

491550701778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345675686 (or 345675683 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 54.

The spelling of 491550701778 in words is "four hundred ninety-one billion, five hundred fifty million, seven hundred one thousand, seven hundred seventy-eight".