268638777831 has 8 divisors (see below), whose sum is σ = 358187513200. Its totient is φ = 179091280512.

The previous prime is 268638777769. The next prime is 268638777859. The reversal of 268638777831 is 138777836862.

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

It is not a de Polignac number, because 268638777831 - 2¹⁰ = 268638776807 is a prime.

It is a super-2 number, since 2×268638777831² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268638777131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497061 + ... + 885633.

It is an arithmetic number, because the mean of its divisors is an integer number (44773439150).

Almost surely, 2^268638777831 is an apocalyptic number.

268638777831 is a deficient number, since it is larger than the sum of its proper divisors (89548735369).

268638777831 is a wasteful number, since it uses less digits than its factorization.

268638777831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619025.

The product of its digits is 113799168, while the sum is 66.

The spelling of 268638777831 in words is "two hundred sixty-eight billion, six hundred thirty-eight million, seven hundred seventy-seven thousand, eight hundred thirty-one".