2138666919 has 16 divisors (see below), whose sum is σ = 2889154560. Its totient is φ = 1407097440.

The previous prime is 2138666851. The next prime is 2138666921. The reversal of 2138666919 is 9196668312.

It is not a de Polignac number, because 2138666919 - 2⁹ = 2138666407 is a prime.

It is a super-2 number, since 2×2138666919² = 9147792380849905122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138661919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58077 + ... + 87465.

It is an arithmetic number, because the mean of its divisors is an integer number (180572160).

Almost surely, 2^2138666919 is an apocalyptic number.

2138666919 is a deficient number, since it is larger than the sum of its proper divisors (750487641).

2138666919 is a wasteful number, since it uses less digits than its factorization.

2138666919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29710.

The product of its digits is 839808, while the sum is 51.

The square root of 2138666919 is about 46245.7232509126. The cubic root of 2138666919 is about 1288.3911033958.

The spelling of 2138666919 in words is "two billion, one hundred thirty-eight million, six hundred sixty-six thousand, nine hundred nineteen".