2081689766 has 16 divisors (see below), whose sum is σ = 3389213184. Its totient is φ = 953213184.

The previous prime is 2081689759. The next prime is 2081689787. The reversal of 2081689766 is 6679861802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311915 + ... + 318518.

It is an arithmetic number, because the mean of its divisors is an integer number (211825824).

Almost surely, 2^2081689766 is an apocalyptic number.

2081689766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2081689766 is a deficient number, since it is larger than the sum of its proper divisors (1307523418).

2081689766 is a wasteful number, since it uses less digits than its factorization.

2081689766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630575.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 2081689766 is about 45625.5385283286. The cubic root of 2081689766 is about 1276.8464373220.

The spelling of 2081689766 in words is "two billion, eighty-one million, six hundred eighty-nine thousand, seven hundred sixty-six".