2166064838 has 16 divisors (see below), whose sum is σ = 3734722080. Its totient is φ = 922946496.

The previous prime is 2166064837. The next prime is 2166064871. The reversal of 2166064838 is 8384606612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166064837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444743 + ... + 449586.

It is an arithmetic number, because the mean of its divisors is an integer number (233420130).

Almost surely, 2^2166064838 is an apocalyptic number.

2166064838 is a deficient number, since it is larger than the sum of its proper divisors (1568657242).

2166064838 is a wasteful number, since it uses less digits than its factorization.

2166064838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894511.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 2166064838 is about 46541.0016866848. The cubic root of 2166064838 is about 1293.8695258019.

The spelling of 2166064838 in words is "two billion, one hundred sixty-six million, sixty-four thousand, eight hundred thirty-eight".