2061662991 has 4 divisors (see below), whose sum is σ = 2748883992. Its totient is φ = 1374441992.

The previous prime is 2061662923. The next prime is 2061663011. The reversal of 2061662991 is 1992661602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2061662991 - 2²⁹ = 1524792079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061667991) 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 3 ways as a sum of consecutive naturals, for example, 343610496 + ... + 343610501.

It is an arithmetic number, because the mean of its divisors is an integer number (687220998).

Almost surely, 2^2061662991 is an apocalyptic number.

2061662991 is a deficient number, since it is larger than the sum of its proper divisors (687221001).

2061662991 is an equidigital number, since it uses as much as digits as its factorization.

2061662991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687221000.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 2061662991 is about 45405.5392105413. The cubic root of 2061662991 is about 1272.7386271438.

The spelling of 2061662991 in words is "two billion, sixty-one million, six hundred sixty-two thousand, nine hundred ninety-one".