491536537056 has 48 divisors (see below), whose sum is σ = 1433648235600. Its totient is φ = 163845512064.

The previous prime is 491536537049. The next prime is 491536537057. The reversal of 491536537056 is 650735635194.

491536537056 is a `hidden beast` number, since 4 + 9 + 1 + 53 + 6 + 537 + 0 + 56 = 666.

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

It is a super-2 number, since 2×491536537056² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 491536536993 and 491536537011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491536537057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284453151 + ... + 284454878.

It is an arithmetic number, because the mean of its divisors is an integer number (29867671575).

Almost surely, 2^491536537056 is an apocalyptic number.

It is an amenable number.

491536537056 is an abundant number, since it is smaller than the sum of its proper divisors (942111698544).

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

491536537056 is a wasteful number, since it uses less digits than its factorization.

491536537056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568908048 (or 568908034 counting only the distinct ones).

The product of its (nonzero) digits is 10206000, while the sum is 54.

The spelling of 491536537056 in words is "four hundred ninety-one billion, five hundred thirty-six million, five hundred thirty-seven thousand, fifty-six".