491488886394 has 48 divisors (see below), whose sum is σ = 1222843171680. Its totient is φ = 141097286880.

The previous prime is 491488886359. The next prime is 491488886543. The reversal of 491488886394 is 493688884194.

491488886394 is a `hidden beast` number, since 4 + 9 + 1 + 488 + 88 + 63 + 9 + 4 = 666.

It is a super-2 number, since 2×491488886394² (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 23 ways as a sum of consecutive naturals, for example, 65319057 + ... + 65326580.

It is an arithmetic number, because the mean of its divisors is an integer number (25475899410).

Almost surely, 2^491488886394 is an apocalyptic number.

491488886394 is an abundant number, since it is smaller than the sum of its proper divisors (731354285286).

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

491488886394 is a wasteful number, since it uses less digits than its factorization.

491488886394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130645675 (or 130645672 counting only the distinct ones).

The product of its digits is 382205952, while the sum is 72.

The spelling of 491488886394 in words is "four hundred ninety-one billion, four hundred eighty-eight million, eight hundred eighty-six thousand, three hundred ninety-four".