2051440168 has 16 divisors (see below), whose sum is σ = 3881740500. Its totient is φ = 1016309376.

The previous prime is 2051440151. The next prime is 2051440169. The reversal of 2051440168 is 8610441502.

It can be written as a sum of positive squares in 2 ways, for example, as 1957000644 + 94439524 = 44238^2 + 9718^2 .

It is not an unprimeable number, because it can be changed into a prime (2051440169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175413 + ... + 1177156.

Almost surely, 2^2051440168 is an apocalyptic number.

It is an amenable number.

2051440168 is a deficient number, since it is larger than the sum of its proper divisors (1830300332).

2051440168 is a wasteful number, since it uses less digits than its factorization.

2051440168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352684 (or 2352680 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 2051440168 is about 45292.8268934497. The cubic root of 2051440168 is about 1270.6315019200.

The spelling of 2051440168 in words is "two billion, fifty-one million, four hundred forty thousand, one hundred sixty-eight".