491784445156 has 6 divisors (see below), whose sum is σ = 860622779030. Its totient is φ = 245892222576.

The previous prime is 491784445153. The next prime is 491784445213. The reversal of 491784445156 is 651544487194.

It can be written as a sum of positive squares in only one way, i.e., 475777134756 + 16007310400 = 689766^2 + 126520^2 .

It is a super-4 number, since 4×491784445156⁴ (a number of 48 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491784445156.

It is not an unprimeable number, because it can be changed into a prime (491784445153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61473055641 + ... + 61473055648.

Almost surely, 2^491784445156 is an apocalyptic number.

It is an amenable number.

491784445156 is a deficient number, since it is larger than the sum of its proper divisors (368838333874).

491784445156 is a wasteful number, since it uses less digits than its factorization.

491784445156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122946111293 (or 122946111291 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 58.

The spelling of 491784445156 in words is "four hundred ninety-one billion, seven hundred eighty-four million, four hundred forty-five thousand, one hundred fifty-six".