838866677661 has 24 divisors (see below), whose sum is σ = 1214842083000. Its totient is φ = 557793948672.

The previous prime is 838866677647. The next prime is 838866677683. The reversal of 838866677661 is 166776668838.

It can be written as a sum of positive squares in 4 ways, for example, as 413494011225 + 425372666436 = 643035^2 + 652206^2 .

It is not a de Polignac number, because 838866677661 - 2¹¹ = 838866675613 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 838866677661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838866677261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7313925 + ... + 7427733.

It is an arithmetic number, because the mean of its divisors is an integer number (50618420125).

Almost surely, 2^838866677661 is an apocalyptic number.

It is an amenable number.

838866677661 is a deficient number, since it is larger than the sum of its proper divisors (375975405339).

838866677661 is a wasteful number, since it uses less digits than its factorization.

838866677661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115933 (or 115930 counting only the distinct ones).

The product of its digits is 585252864, while the sum is 72.

The spelling of 838866677661 in words is "eight hundred thirty-eight billion, eight hundred sixty-six million, six hundred seventy-seven thousand, six hundred sixty-one".