2051775638 has 16 divisors (see below), whose sum is σ = 3358184400. Its totient is φ = 932421600.

The previous prime is 2051775631. The next prime is 2051775683. The reversal of 2051775638 is 8365771502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051775631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146168 + ... + 159588.

It is an arithmetic number, because the mean of its divisors is an integer number (209886525).

Almost surely, 2^2051775638 is an apocalyptic number.

2051775638 is a deficient number, since it is larger than the sum of its proper divisors (1306408762).

2051775638 is a wasteful number, since it uses less digits than its factorization.

2051775638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20383.

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 2051775638 is about 45296.5300878555. The cubic root of 2051775638 is about 1270.7007598530.

The spelling of 2051775638 in words is "two billion, fifty-one million, seven hundred seventy-five thousand, six hundred thirty-eight".