2551851816 has 32 divisors (see below), whose sum is σ = 6552054240. Its totient is φ = 827627328.

The previous prime is 2551851811. The next prime is 2551851823. The reversal of 2551851816 is 6181581552.

It is not an unprimeable number, because it can be changed into a prime (2551851811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1435966 + ... + 1437741.

It is an arithmetic number, because the mean of its divisors is an integer number (204751695).

Almost surely, 2^2551851816 is an apocalyptic number.

It is an amenable number.

2551851816 is an abundant number, since it is smaller than the sum of its proper divisors (4000202424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2551851816 is a wasteful number, since it uses less digits than its factorization.

2551851816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873753 (or 2873749 counting only the distinct ones).

The product of its digits is 96000, while the sum is 42.

The square root of 2551851816 is about 50515.8570747840. The cubic root of 2551851816 is about 1366.5278399006.

The spelling of 2551851816 in words is "two billion, five hundred fifty-one million, eight hundred fifty-one thousand, eight hundred sixteen".