2551011811 has 4 divisors (see below), whose sum is σ = 2661925392. Its totient is φ = 2440098232.

The previous prime is 2551011787. The next prime is 2551011821. The reversal of 2551011811 is 1181101552.

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

It is a cyclic number.

It is not a de Polignac number, because 2551011811 - 2¹⁹ = 2550487523 is a prime.

It is a super-2 number, since 2×2551011811² = 13015322519722999442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551011821) 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, 55456756 + ... + 55456801.

It is an arithmetic number, because the mean of its divisors is an integer number (665481348).

Almost surely, 2^2551011811 is an apocalyptic number.

2551011811 is a deficient number, since it is larger than the sum of its proper divisors (110913581).

2551011811 is a wasteful number, since it uses less digits than its factorization.

2551011811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110913580.

The product of its (nonzero) digits is 400, while the sum is 25.

The square root of 2551011811 is about 50507.5421199646. The cubic root of 2551011811 is about 1366.3778813246.

The spelling of 2551011811 in words is "two billion, five hundred fifty-one million, eleven thousand, eight hundred eleven".