2051378018 has 4 divisors (see below), whose sum is σ = 3077067030. Its totient is φ = 1025689008.

The previous prime is 2051377987. The next prime is 2051378033. The reversal of 2051378018 is 8108731502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2040599929 + 10778089 = 45173^2 + 3283^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512844503 + ... + 512844506.

Almost surely, 2^2051378018 is an apocalyptic number.

2051378018 is a deficient number, since it is larger than the sum of its proper divisors (1025689012).

2051378018 is a wasteful number, since it uses less digits than its factorization.

2051378018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025689011.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 2051378018 is about 45292.1407972730. The cubic root of 2051378018 is about 1270.6186701955.

The spelling of 2051378018 in words is "two billion, fifty-one million, three hundred seventy-eight thousand, eighteen".