2086398661 has 8 divisors (see below), whose sum is σ = 2268834840. Its totient is φ = 1910596608.

The previous prime is 2086398659. The next prime is 2086398679. The reversal of 2086398661 is 1668936802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 348009025 + 1738389636 = 18655^2 + 41694^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2086398661 - 2¹ = 2086398659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2086398361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1657876 + ... + 1659133.

It is an arithmetic number, because the mean of its divisors is an integer number (283604355).

Almost surely, 2^2086398661 is an apocalyptic number.

It is an amenable number.

2086398661 is a deficient number, since it is larger than the sum of its proper divisors (182436179).

2086398661 is a wasteful number, since it uses less digits than its factorization.

2086398661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317063.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 2086398661 is about 45677.1130983559. The cubic root of 2086398661 is about 1277.8084775566.

The spelling of 2086398661 in words is "two billion, eighty-six million, three hundred ninety-eight thousand, six hundred sixty-one".