491149804518 has 24 divisors (see below), whose sum is σ = 1064171487600. Its totient is φ = 163714512624.

The previous prime is 491149804487. The next prime is 491149804543. The reversal of 491149804518 is 815408941194.

491149804518 is a `hidden beast` number, since 4 + 9 + 1 + 1 + 49 + 80 + 4 + 518 = 666.

It is a super-2 number, since 2×491149804518² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 2030368 + ... + 2259356.

It is an arithmetic number, because the mean of its divisors is an integer number (44340478650).

Almost surely, 2^491149804518 is an apocalyptic number.

491149804518 is an abundant number, since it is smaller than the sum of its proper divisors (573021683082).

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

491149804518 is a wasteful number, since it uses less digits than its factorization.

491149804518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348156 (or 348153 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 491149804518 in words is "four hundred ninety-one billion, one hundred forty-nine million, eight hundred four thousand, five hundred eighteen".