491873991878 has 8 divisors (see below), whose sum is σ = 737853484368. Its totient is φ = 245922830424.

The previous prime is 491873991877. The next prime is 491873991883. The reversal of 491873991878 is 878199378194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491873991877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7039301 + ... + 7108832.

It is an arithmetic number, because the mean of its divisors is an integer number (92231685546).

Almost surely, 2^491873991878 is an apocalyptic number.

491873991878 is a deficient number, since it is larger than the sum of its proper divisors (245979492490).

491873991878 is a wasteful number, since it uses less digits than its factorization.

491873991878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14165518.

The product of its digits is 219469824, while the sum is 74.

The spelling of 491873991878 in words is "four hundred ninety-one billion, eight hundred seventy-three million, nine hundred ninety-one thousand, eight hundred seventy-eight".