491878861792 has 24 divisors (see below), whose sum is σ = 969883283376. Its totient is φ = 245559297792.

The previous prime is 491878861763. The next prime is 491878861811. The reversal of 491878861792 is 297168878194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11858133 + ... + 11899540.

It is an arithmetic number, because the mean of its divisors is an integer number (40411803474).

Almost surely, 2^491878861792 is an apocalyptic number.

It is an amenable number.

491878861792 is a deficient number, since it is larger than the sum of its proper divisors (478004421584).

491878861792 is a wasteful number, since it uses less digits than its factorization.

491878861792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23758330 (or 23758322 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 70.

The spelling of 491878861792 in words is "four hundred ninety-one billion, eight hundred seventy-eight million, eight hundred sixty-one thousand, seven hundred ninety-two".