2051666687 has 8 divisors (see below), whose sum is σ = 2408134176. Its totient is φ = 1711042272.

The previous prime is 2051666599. The next prime is 2051666789. The reversal of 2051666687 is 7866661502.

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 2051666687 - 2¹⁰ = 2051665663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051665687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3960488 + ... + 3961005.

It is an arithmetic number, because the mean of its divisors is an integer number (301016772).

Almost surely, 2^2051666687 is an apocalyptic number.

2051666687 is a deficient number, since it is larger than the sum of its proper divisors (356467489).

2051666687 is an equidigital number, since it uses as much as digits as its factorization.

2051666687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921537.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 2051666687 is about 45295.3274301003. The cubic root of 2051666687 is about 1270.6782676977.

The spelling of 2051666687 in words is "two billion, fifty-one million, six hundred sixty-six thousand, six hundred eighty-seven".