2631662665 has 4 divisors (see below), whose sum is σ = 3157995204. Its totient is φ = 2105330128.

The previous prime is 2631662639. The next prime is 2631662687. The reversal of 2631662665 is 5662661362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 772673209 + 1858989456 = 27797^2 + 43116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631662665 - 2⁹ = 2631662153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 263166262 + ... + 263166271.

It is an arithmetic number, because the mean of its divisors is an integer number (789498801).

Almost surely, 2^2631662665 is an apocalyptic number.

It is an amenable number.

2631662665 is a deficient number, since it is larger than the sum of its proper divisors (526332539).

2631662665 is an equidigital number, since it uses as much as digits as its factorization.

2631662665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526332538.

The product of its digits is 466560, while the sum is 43.

The square root of 2631662665 is about 51299.7335763062. The cubic root of 2631662665 is about 1380.6281997765.

The spelling of 2631662665 in words is "two billion, six hundred thirty-one million, six hundred sixty-two thousand, six hundred sixty-five".