231800778905 has 16 divisors (see below), whose sum is σ = 305531464320. Its totient is φ = 168042302208.

The previous prime is 231800778887. The next prime is 231800778931. The reversal of 231800778905 is 509877008132.

It is a cyclic number.

It is not a de Polignac number, because 231800778905 - 2¹⁰ = 231800777881 is a prime.

It is a super-2 number, since 2×231800778905² (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 15 ways as a sum of consecutive naturals, for example, 53041472 + ... + 53045841.

It is an arithmetic number, because the mean of its divisors is an integer number (19095716520).

Almost surely, 2^231800778905 is an apocalyptic number.

It is an amenable number.

231800778905 is a deficient number, since it is larger than the sum of its proper divisors (73730685415).

231800778905 is a wasteful number, since it uses less digits than its factorization.

231800778905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106087360.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 231800778905 in words is "two hundred thirty-one billion, eight hundred million, seven hundred seventy-eight thousand, nine hundred five".