491616166518 has 12 divisors (see below), whose sum is σ = 1065168360828. Its totient is φ = 163872055500.

The previous prime is 491616166513. The next prime is 491616166537. The reversal of 491616166518 is 815661616194.

491616166518 is a `hidden beast` number, since 4 + 9 + 1 + 6 + 1 + 61 + 66 + 518 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491616166513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13656004608 + ... + 13656004643.

It is an arithmetic number, because the mean of its divisors is an integer number (88764030069).

Almost surely, 2^491616166518 is an apocalyptic number.

491616166518 is an abundant number, since it is smaller than the sum of its proper divisors (573552194310).

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

491616166518 is a wasteful number, since it uses less digits than its factorization.

491616166518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27312009259 (or 27312009256 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 491616166518 in words is "four hundred ninety-one billion, six hundred sixteen million, one hundred sixty-six thousand, five hundred eighteen".