811358778508 has 24 divisors (see below), whose sum is σ = 1422786238272. Its totient is φ = 404848988544.

The previous prime is 811358778487. The next prime is 811358778539. The reversal of 811358778508 is 805877853118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5812266 + ... + 5950222.

It is an arithmetic number, because the mean of its divisors is an integer number (59282759928).

Almost surely, 2^811358778508 is an apocalyptic number.

It is an amenable number.

811358778508 is a deficient number, since it is larger than the sum of its proper divisors (611427459764).

811358778508 is a wasteful number, since it uses less digits than its factorization.

811358778508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140961 (or 140959 counting only the distinct ones).

The product of its (nonzero) digits is 15052800, while the sum is 61.

The spelling of 811358778508 in words is "eight hundred eleven billion, three hundred fifty-eight million, seven hundred seventy-eight thousand, five hundred eight".