838581661 has 16 divisors (see below), whose sum is σ = 938096640. Its totient is φ = 745803520.

The previous prime is 838581647. The next prime is 838581673. The reversal of 838581661 is 166185838.

It is not a de Polignac number, because 838581661 - 2⁷ = 838581533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838581631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5076 + ... + 41266.

It is an arithmetic number, because the mean of its divisors is an integer number (58631040).

Almost surely, 2^838581661 is an apocalyptic number.

It is an amenable number.

838581661 is a deficient number, since it is larger than the sum of its proper divisors (99514979).

838581661 is a wasteful number, since it uses less digits than its factorization.

838581661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36284.

The product of its digits is 276480, while the sum is 46.

The square root of 838581661 is about 28958.2744824342. The cubic root of 838581661 is about 943.0074421762.

The spelling of 838581661 in words is "eight hundred thirty-eight million, five hundred eighty-one thousand, six hundred sixty-one".